248 results about "Multipath transmission" patented technology

Closed loop wireless communication of signals using an adaptive transmit antenna array (3), in which a plurality of copies of signals to be transmitted by the transmit antenna array (3) are produced with delays and weights (w_n^j) that are functions of the multi-path transmission channel characteristics (H) from the transmit antenna array (3) to a receive antenna array (4) of a receiver (2) and are combined before transmission by the transmit antenna array. The delays and weights (w_n^j) of the transmit copies for each transmit antenna element are functions of the respective multi-path transmission channel characteristics $\left(h_{n,m=1}^{l=1},\dots ,h_{n,m=M}^{l=L}\right)$

from that transmit antenna element to the receive antenna array (4) ssuch that the multi-path signal components propagated to each receiver element are received with distinguishable delays according to the propagation path. The receiver (2) combines the received signal components from each receive antenna element with delays and weights (u) that are respective functions of the multi-path transmission channels.

Preferably, the receiver comprises a multi-finger RAKE receiver (6) that copies the received signals from the receive antenna array with delays and weights (u) that are respective functions of the multi-path transmission channels and combines the copied received signals.

The present invention is directed towards systems and methods for multipath transmission control protocol connection (MPTCP) management. A first device, intermediary between a second device and a third device, may establish a protocol control structure responsive to establishment of a MPTCP session between the first device and the second device. The first device may maintain, via the protocol control structure, an identification of a plurality of subflows comprising transmission control protocol (TCP) connections in the MPTCP session between the first device and the second device. The first device may convert or translate, via the protocol control structure, subflow-specific sequence identifiers of packets transmitted via each of the plurality of subflows, to sequence identifiers unique across the plurality of subflows and identifying related packets from each subflows to be processed at the third device. The third device may receive the packets with the converted sequence identifiers in a single TCP connection.

The invention discloses a method for reducing an influence of data packet disorder on stream control transmission protocol (SCTP) multipath transmission. The method comprises the following steps of: (1) acquiring metric values of paths according to the path bandwidth, the delay and the packet loss ratio, measured in real time, of each independent path; and performing path scheduling and data packet distribution according to the metric values; and (2) judging a path which loses a data packet by using a transmitting terminal through an SACK block transmitted by a receiving terminal and carryingout end-to-end path-based data packet rapid transmission. The method can effectively reduce the influence of the data packet disorder on the SCTP multipath transmission, and can improve the performance of SCTP-based end-to-end multipath.

The invention provides an improved weighting trilateral positioning method based on RSSI (received signal strength indicator) in a wireless sensor network and relates to the field of node self-positioning in the wireless sensor network. The method is used for solving the problem that a bigger positioning error is easily caused by the using of the traditional method which cannot meet the indoor positioning requirement in real life because the traditional method is limited by the factors such as signal multipath transmission, sight distance, low coordinate calculation precision, and the like. The method provided by the invention comprises the following steps: starting an unknown node positioning function and guiding an unknown node to send out a message; after receiving the message from the unknown node by an anchor node, calculating RSSI and storing in a hardware register; sending the ID number, RSSI value and position information (Xi, Yi) (i is equal to 1,2,...), which are distributed to the anchor node, to the unknown node by the anchor node; sequencing the anchor node according to the size of the received RSSI, and choosing N anchor nodes having big RSSI for self-positioning, wherein N is more than or equal to 3; according to the information of N anchor nodes, confirming the weighted value by the using of the trilateral positioning method; and using a weighting algorithm to calculate the coordinate of the unknown node. The method provided by the invention is used for weighting the coordinate information by utilizing the weighting principle.

The invention relates to a multi-path transmission control terminal and a method for supporting multi-service data transmission, and belongs to the technical field of network communication. The terminal is arranged on an end point of data transmission and comprises a multi-path session management module, a path management module, a flow division module, a path selection module, a substream sending control module, a substream receiving control module, a rectification recombination module, a path transmission quality report module and a path evaluation module. When data stream of an upper application is received, the data stream is divided into stream blocks, a path is selected for each stream block, stream blocks dispatched to the same path form a substream, the stream blocks are further divided into transmission units and are packaged into multi-path transmission packages and are transmitted to an opposite terminal, according to the path transmission quality fed by the opposite terminal, a path selection strategy is dynamically adjusted; when the multi-path transmission data packages are received, substream data is recombined and is further recombined into data streams and the data streams are transmitted to the upper application. The terminal and method can meet different transmission requests of various business types, and the multi-path transmission efficiency is improved.

A reception method and receiver structure that are relatively simple, that have close to optimum performance, and that use high order modulation combined with a low spreading factor are disclosed. The method receives a signal transmittal in the form of sequences of coded binary symbols comprising both predefined pilot symbols and date symbols multiplied by a spreading sequence. The method also includes a step of determining a channel estimate using received predefined pilot symbols. A system for receiving a signal transmitted on a multipath transmission channel using a spread spectrum technique and low spreading factor is also disclosed.

A method and system for transmitting plural synchronous video streams over multiple wireless paths, is provided. One implementation involves, for each video stream, partitioning spatially correlated pixels into different partitions, and placing pixels from different partitions into different packets. Then, performing multipath transmission of the plural video streams by alternating transmission of packets from each video stream over multiple paths, while maintaining video information for the plural video streams synchronized during transmission.

An edge router runs a Multipath Transmission Control Protocol (MPTCP) proxy to allow for a host that implements TCP (Transmission Control Protocol) to operate normally yet reap the benefits of an MPTCP connection. An upgrade of a TCPIP stack on the host is not necessary. The edge router demultiplexes packets received from the host over a TCP connection to an MPTCP connection and multiplexes packets sent to the host over an MPTCP connection to a TCP connection. As a result, higher throughput of packet communication can be realized, for example, for improved video support.

A method and apparatus for handling MPTCP signalling in a communications network. The communications network includes a first node hosting an MPTCP proxy function, and a second node in a second access network. The second node receives from a mobile terminal an attachment request. It then sends a message to a remote database and receives a response, the response including an identity of the first node. An MPTCP data path can then be redirected from the second access network to the MPTCP proxy function. Even in cases where the MPTCP proxy function is located at or between the PDN Gateway and the mobile terminal, the second access can be made aware of the location of the MPTCP proxy function and route MPTCP data traffic accordingly.

The present invention relates to an uplink control channel configuration in a mobile wideband wireless access system, and an allocation method thereof. An uplink control channel includes a long cyclic prefix used to improve interference and distortion caused by multipath transmission characteristics of an initial ranging or handover ranging signal and a periodic ranging or band request ranging signal. In addition, a short orthogonal frequency division multiple (OFDM) symbol is used to transmit uplink control information when one terminal exists or the number of terminals is small.

The invention relates to a multipath parallel transmission method facing a satellite network, which is a control method for carrying out data transmission in a satellite network transmission layer. By combining the satellite network with the multipath transmission characteristics, the multipath parallel transmission method facing the satellite network has the following improvements that on the basis of relieving the cache congestion of a receiving end, a loss differentiation method on the basis of delay jitter is adopted; the receiving end transmits a congestion mark to a source end through a confirmation packet; the source end correspondingly regulates congestion windows and regulates the sending rate by combining the congestion mark with a data block retransmission mark; simultaneously, the source end compares time delays of data packets fed back by all target nodes and uses one path with the shortest time delay as the optimal path of a feedback packet; and the source end is beneficial for more rapidly regulating the congestion windows, reducing the network performance deterioration caused by excessively higher increase rate of the windows, timely retransmitting lost data blocks and improving the performances of the multipath parallel transmission in the satellite network on the aspects of throughput, window jitter, time delay, packet loss and the like.

Disclosed are a wireless multipath transmission method and system, a data transmitting device and a data receiving device, the method includes: a data transmitting end encoding a plurality of original data packets, herein the number of encoded data packets is greater than the number of original data packets; the data transmitting end transmitting the encoded data packets to a data receiving end over different transmission links; the data receiving end receiving the data packets from the different transmission links, decoding to obtain the original data packets. The abovementioned technical solution encodes and distributes the original data packets, and flexibly realizes the multipath data transmission, moreover, the technical solution further considers configuration information of the encoding when distributing the encoded data packets, thus effectively utilizing resources provided by each link to serve the user with data transmission, improving the throughput, and reducing the transmission delay.

The invention relates to a multipath routing method based on wireless multi-media sensor network, which aims to the technical scheme of multimedia data stream transmission in the wireless multimedia sensor network. The multipath routing method is mainly used for solving the problem about the real-time transmission of the multimedia steam and prolonging the service life of the network as long as possible. The multipath routing method is characterized in that data from a source node to a target node in the wireless multi-media sensor network are transmitted by adopting a multipath transmission mode, and moreover higher service quality is provided for users by adopting a partitioning service mode.

The invention discloses a multipath flexible piece two-joint compound robot finger device and belongs to the technical field of human simulating manipulators. The multipath flexible piece two-joint compound robot finger device comprises a base, a motor, a speed reducer, a base shaft, a near joint shaft, a middle finger section, a remote joint shaft, a tail end finger section, a multipath transmission mechanism and a spring piece. In the device, by the single motor, the multi-shaft and multipath transmission mechanism with a different transmission ratio, the spring piece and the like, a compound underactuated catching effect is comprehensively achieved; the finger rotatably moves to an object in a coupled way and adaptively catches the object; the catching process stimulates the operation of a human, the action is flexible, and the object is caught stably; furthermore, the robot finger device can automatically and adaptively catch objects with different sizes and shapes, has low requirement on a control system, a simple and compact structure, high transmission efficiency, low cost, and an appearance similar to that of a human finger, and is easy to operate, and convenient to assemble and maintain, and is low in energy loss, and applicable to the human- manipulator at the same time.

System and methods are disclosed for passively determining the location of a moveable transmitter utilizing a pair of phase shifts at a receiver for extracting a direction vector from a receiver to the transmitter. In a preferred embodiment, a phase difference between the transmitter and receiver is extracted utilizing a noncoherent demodulator in the receiver. The receiver includes an antenna array with three antenna elements, which preferably are patch antenna elements spaced apart by one-half wavelength. Three receiver channels are preferably utilized for simultaneously processing the received signal from each of the three antenna elements. Multipath transmission paths for each of the three receiver channels are indexed so that comparisons of the same multipath component are made for each of the three receiver channels. The phase difference for each received signal is determined by comparing only the magnitudes of received and stored modulation signals to determine a winning modulation symbol.

Mobile management in a cellular network utilizes the multipath-transfer control protocol (MP-TCP). A mobile device establishes a first multipath-transfer control protocol (MP-TCP) subflow to a corresponding node using a first internet protocol (IP) address corresponding to the mobile device. At least a portion of the first IP address is uniquely associated with the first coverage area. The mobile device establishes a second MP-TCP subflow using a second IP address corresponding to the mobile device while the mobile device is in an overlapped coverage area including a first portion of the first coverage area and a second portion of a second coverage area. At least a portion of the second IP address is uniquely associated with the second coverage area. The mobile node turns off the first subflow when the mobile node determines it has left the first coverage area.

The invention discloses an overlay-network-multipath-transmission based Internet protocol multimedia subsystem (IMS) client and a media exchange method. The IMS client can perform multi-path real-time media transmission negotiation on the basis of an overlay network and establish a plurality of paths to transmit real-time media, and the paths can be switched according to a path quality monitoring result in a transmission process. The multi-path transmission of the real-time media can be realized by the IMS client, and real-time media network transmission performance in IMS communication can be effectively improved.

The present disclosure relates to a method performed in a Multipath Transmission Control Protocol (MPTCP) scheduler which is scheduling a TCP flow between a first peer (7) and an MPTCP capable second peer (2). The method comprises setting up the TCP flow comprising at least two sub-flows (8) connecting the MPTCP capable second peer, each sub-flow being associated with an address for the MPTCP capable second peer. The method also comprises receiving external information relating to at least one of the at least two sub-flows. The method also comprises scheduling data in the TCP flow based on the received external information, wherein the scheduling comprises choosing which sub-flow or sub-flows of the at least two sub-flows to schedule the data via, based on the received external information. The present disclosure also relates to an MPTCP scheduler as well as an MPTCP proxy and an MPTCP capable peer comprising such a scheduler.