573results about How to "Guaranteed transmission quality" patented technology

The invention embodiment discloses a method and a device for forwarding a data frame based on line bundle. The method for forwarding the data frame based on line bundle comprises the following steps: acquiring a first data frame transmitted by a user side or a network side; dividing the first data frame when the first data frame is greater than the maximum transmission unit MTU of any access linebundled to the user, wherein the sub data frames obtained from division are all less than or equal to the MTU; adding logical identifiers corresponding to the access line bundled to the user to the sub data frames; and transmitting a second data frame comprising the sub data frames and the logical identifiers of the sub data frames so that the data frame can be reformed after being received at anopposite end. The method and the device for forwarding the data frame based on the line bundle increase the bandwidth of the access line, prolong the transmission distance and improve the transmission reliability on the basis of ensuring the transmission quality of the access line.

The invention discloses a method for cooperation partner selection and precoding cooperative communications in a cellular communication system. The method comprises the following steps: (1) a user terminal with bad uplink channel quality sends a cooperative communication request to a base station; (2) the base station selects a partner terminal for the user terminal; (3) in a first frame of a cooperation period, the user terminal sends local data to the base station, and the base station and the partner terminal receive the data simultaneously; (4) in a second frame of the cooperation period, the partner terminal sends the local data to the base station, and the base station and the user terminal receive the data simultaneously; (5) in a third frame of the cooperation period, the user terminal and the partner terminal preprocess the relay data by a precoding matrix which is fed back by the base station, and send the relay data to the base station simultaneously; and (6) the base station judges the signals received in the transmission time slots of different frames in a combination way to obtain an estimated value of the sent signal. The method has the advantages of low complexity and high utilization rate of the system resources, and is used for the reliable data transmission in the cellular communication system.

The invention relates to a rapid and intelligent public transportation three-dimensional monitoring and controlling device and an operating method thereof, which belongs to the technical field of public transportation. The device comprises a monitoring and controlling dispatching center, a vehicle mobile monitoring and controlling terminal and a platform fixed monitoring and controlling terminal, wherein, the vehicle mobile monitoring and controlling terminal and the platform fixed monitoring and controlling terminal are connected with the monitoring and controlling dispatching center through an Internet and a WiMAX network. The method comprises the following steps: the vehicle mobile monitoring and controlling terminal and the platform fixed monitoring and controlling terminal are set, the video information inside the bus, the video information for the platform environment and the passengers on the platform as well as the relevant GPS information are gathered in a real-time manner and transmitted based on the WiMAX network, and the vehicle mobile monitoring and controlling terminal performs the interactive function of intelligent bus stop announcement and scheduling information at the same time. By using the realized three-dimensional monitoring and controlling and dispatching, not only the security of bus running and the intelligence of bus stop announcement can be enhanced, but also the real-time grasping of the control center to the number of the passengers can be improved, and the allocation of the rapid bus vehicles can be performed according to the passenger flow volume, and the scheme and the support method are provided for the automation, the safety running and the management of the rapid bus system.

A video meeting system based on P2 P and SIP comprises meeting agent server, meeting control server and client end. It is featured as dividing client end to be sponsor client end and normal client end, using extended SIP as communication protocol and applying P2 P as network structure.

The invention discloses a method for controlling the interference of a downstream measurement reference signal and equipment thereof, which are applied to a high-level long-term evolution LTE-A system. The method comprises the following steps of: a base station configures the sequence, and/or the frequency domain resource, and/or the time domain resource to a downstream measurement reference signal; the base station transmits configuration information of the downstream measurement reference signal to a user terminal; the base station transmits the downstream measurement reference signal to the user terminal respectively through the sequence, and/or the frequency domain resource, and/or the time domain resource; and the user terminal receives the downstream measurement reference signal transmitted by the base station according to the configuration information of the downstream measurement reference signal. With the mode, the invention effectively prevents the downstream measurement reference signals of each block from being interfered on the basis that the downstream measurement reference signal is smoothly transmitted and the system performance is guaranteed.

The disclosed printing circuit board (PCB) is composed of two outer layers and one inner layer. The outer layer is made from plate of capable of transmitting signal in high speed; and the inner layer is made from general plate. Method for fabricating PCB includes following steps: carrying blackening / browning treatment; superimposing and pressing prepreg and outer copper foil together so as to form multilayer half finished board; drilling holes on multilayer board, plating via holes, using negative plate imaging and etching to prepare needed ducting lines in each core plate in inner layer; obtaining lines on outer layer so as to produce multilayer PCB in hybrid plates; back drilling technical holes in order to take out STUB with no connection and no attribute on end part of via holes. Features of the PCB are: high-speed signal transmission in low cost, high reliability, guaranteeing rate of good quality of PCB produced, and transmission quality of high-speed signal.

The invention discloses a terminal video communication quality adjusting method and a system. Statistics of sending code rates and sending frame rates for sending video data is carried out through a sending terminal at each preset time interval, statistics of receiving code rates, receiving frame rates and packet loss rates for receiving the video data is carried out through a receiving terminal at each preset time interval; a frame rate fitting degree and a code rate fitting degree of the sending terminal and the receiving terminal, and the average time delay and the average packet loss rate of the receiving terminal are calculated; video communication transmission qualities of the sending terminal and the receiving terminal are analyzed according to the fitting degrees, the average time delay and the average packet loss rate to obtain corresponding analysis results; a video image resolution, a coding frame rate and/or a coding code rate of the sending terminal are correspondingly adjusted according to the analysis results to improve the video communication transmission quality, so coding parameters of video communication can be automatically adjusted by the terminal during bandwidth fluctuation, bandwidth change is further adaptable, and real-time performance and stability of the video communication are guaranteed.

The invention relates to a method for real-time detecting under-mine worker via IEEE802.15.4 technique. Wherein, it arranges one or several networks at tree, star or mesh structure in the under-mine channel; each network is formed by one base station and several routes; the worker is arranged with positioning device; the base station, route and positioning device are connected via IEEE802.15.4 wireless network protocol; the base station and superior control computer are connected by Ethernet or RS485 communication protocol; the RRSI value of wireless electric signal between network nodes is relative to the spatial distance, via self learnt network, said relationship can be fixed, and the positioning device can via said relationship and tested RRSI value, fixes the spatial position and sends the information to the computer control system to real-time detect the under-mine worker.

Disclosed are a transmission resource allocation method, device and system, and base station equipment, which are used for avoiding the mutual interference of two carriers in a terminal when any two carriers are used to simultaneously transmit information in opposite directions and increasing the information transmission efficiency. The transmission resource allocation method comprises: when it is judged that the transmission directions of information which are borne in a first carrier and a second carrier simultaneously scheduled for a terminal at a scheduling moment are opposite, determining a time-domain resource occupied by the information borne in the first carrier; and determining the time-domain resource except the time-domain resource occupied by the information borne in the first carrier as an available time-domain resource of the second carrier.

The embodiment of the invention provides a flow control method and system, and a centralized controller, and relates to the technical field of communication. The problem that flow is only forwarded according to an IP path in a flow dredging process, resulting in that the flow transmission effect cannot meet the actual demands of a user to the business quality in the prior art is solved. The method comprises the following steps: a network edge device sends network monitoring information of a user terminal to the centralized controller, wherein the network monitoring information comprises a flow type and an occupied bandwidth; a network forwarding device sends link delay information to the centralized controller, wherein the link delay information comprises a residual bandwidth of the link and a link transmission delay; the centralized controller determines a target forwarding path according to the network monitoring information sent by the network edge device, the link delay information sent by the network forwarding device and business demand information, and releases the target forwarding path and a flow control strategy to a network device. The flow control method and system, and the centralized controller provided by the invention are applied to flow control.

The invention relates to a wireless communication technology, particularly to a method and equipment for determining the number of CCE (Channel Control Equipment), which not only can be used for determining the number of the CCE, but also has cell capacity and PDCCH demodulation performance, so that the selected number of the CCE is relatively reasonable, thereby reducing the influence on the capacity of cells and the transmission quality of the PDCCH. The method of the embodiment of the invention comprises the following steps of: determining the maximum number of bits carried by each selectable PDCCH in a wireless frame according to CQI information; determining the quality parameter of each PDCCH according to the determined maximum number of bits carried by each PDCCH and the data size of the control signaling needing to be transmitted currently; and comparing the maximum quality parameter in the determined quality parameters of all PDCCHs with the threshold value, selecting a PDCCH from all selectable PDCCHs in the wireless frame according to the comparative result, and determining the number of control channel blocks corresponding to the selected PDCCH.

The invention relates to a Beidou 2nd generation B1 and B3 double-frequency receiver, the receiver comprises an amplifying and filtering circuit, a power dividing circuit, a B1 narrow-band band-pass filter, a B3 narrow-band band-pass filter, a down-conversion and analog-digital conversion sampling circuit, a crystal oscillator, an intermediate frequency (IF) digital signal processing circuit, a measured data preprocessing module, a combined filtering module and a navigation and positioning module. According to the invention, the civilian used Beidou 2nd generation B1, B3 double-frequency signal double-end selectable input is adopted by the receiver, the B1, B3 double-frequency signal can be simultaneously demodulated and performed positioning calculation, a self-adaptive difference positioning algorithm is adopted, the dependency of GPS system is avoided, the navigation and positioning precision of Beidou system is effectively improved, and a reliable positioning continuity and a relatively high positioning precision are provided under conditions of poor observation condition and less available satellite number.

The invention discloses a method, a device and a system for processing information. The method comprises the following steps: receiving the data to be sent by layers above a physical layer of an information sending device, using short-code long error correcting codes to carry out error correction coding, and encapsulating the data into code blocks comprising data blocks and check blocks; carryingout cyclic redundancy check (CRC) coding on the encapsulated code blocks by the layers above the physical layer, adding packet head information on the code blocks which are processed by CRC coding, encapsulating into protocol data unit (PDU) data packets, and sending the data packets to the physical layer; after the physical layer receives the PDU data packets, carrying out physical layer coding;and modulating and sending the PDU data packets after physical layer coding. Because the process of short-code long error correcting code coding for the transmitted data information is added for the layers above the physical layer, the reliability and the quality of the data transmission are improved, the probability that the data needs to be retransmitted is reduced, the processing of the systemfor the retransmitted data is reduced, and the resources and the cost of the system are saved.

The invention relates to the field of wireless communication and discloses a wireless terminal and a wireless communication method thereof. The wireless terminal at least supports a first communication mode and a second communication mode, the wireless terminal at least comprises a first antenna group and a second antenna group, and the first antenna group and the second antenna group both comprise at least one antenna. The wireless communication method comprises the steps of enabling the first antenna group to be independently occupied by the first communication mode and enabling the second antenna group to be subject to time division multiplexing by the first communication mode and the second communication mode when the first communication mode is in a connected state and the second communication mode is an idle state. According to the wireless terminal and the wireless communication method, the number of the antennas needed when one communication mode is in the connected state and the other communication mode is in the idle state, and good communication quality is maintained simultaneously.

The invention discloses a method and device for controlling the drift of MAC (media access control) addresses, wherein the method comprises the following steps: searching an MAC address entry matched with a received data message from an MAC address list; if the MAC address entry is searched, judging whether the number of a port of the MAC address entry is consistent with the number of a port into which the data message flows; if the numbers are inconsistent, comparing the priority of the port at which the MAC address entry points with the priority of the port in which the data message flows; and if the priority of the port at which the MAC address entry points is higher than the priority of the port in which the data message flows, setting that the MAC address entry is not allowed to drift. The method and the device of the invention have the advantages of solving the problem of network congestion caused by the drift of the MAC addresses in the prior art, and guaranteeing the quality of network transmission.

Provided is a heterogeneous sensor network and method for bridge and major infrastructure structure safety monitoring and early warning. A sensor module is adopted to be installed on key structure points of major infrastructures such as bridges and is used for monitoring vibration, strain and environment humiture and illumination information of the key structure points. A wired sensor node is installed on key structure points of main towers of the bridges and on the inside portions of steel box girders and used for collecting vibration, strain gage information and environment information such as temperature and humidity of the main towers and the steel box girders, and a wire transmission mode is adopted. A wireless sensor node is installed on key structure points of main cables and suspension cables of the bridges and used for collecting vibration, information of strain and the like, and environment information such as temperature and humidity of the main cables and the suspension cables. The heterogeneous sensor network and method for the bridge and major infrastructure structure safety monitoring and early warning can be used for evaluating and early warning for monitored major infrastructure structure safety states.

A wireless communication system wherein a simple structure is used to maintain, even under a quasi-static fading environment of wireless communication, the transmission quality of a wireless line used between particular radio stations, while reducing the influence of radio wave interference with other radio stations using the same frequency band, and further preventing information from leaking to other radio stations. A transmitter station (101) selects, based on quality information of a transmission path (104), an optimum one of a plurality of antennas to transmit a packet from the selected antenna to a receiver station (102). The receiver station (102) uses an antenna, selected from among a plurality of antennas, to receive the packet from the transmitter station (101), and switches from the currently selected antenna to another one. Then, the receiver station (102) transmits, from the other antenna, a response packet, which is responsive to the received packet, to the transmitter station (101). The transmitter station (101) uses the plurality of antennas to receive the response packet, and selects, as a packet transmission antenna, an antenna, which exhibits the best reception quality, to transmit a packet from the selected antenna to the receiver station (102). This process is repeated hereafter.

The utility model relates to a selection method of transmission rate and modulation code and the device, which comprises the following steps: a lowest and a highest transmission block threshold mapping relation is established to get the spread factors used by each transmission block under a certain time slot number and the corresponding modulation code mode; a power relative value mapping relation is established, and the biggest and the smallest values of the transmission block supported by QPSK and 16QAM modulation modes are acquired according to the dispatching information to determine the transmission block range; the power thresholds needed by the smallest value and the biggest value of each transmission block are calculated; the power threshold value proximal to the power permitted value within the power threshold range is selected, and the lowest and the highest transmission block threshold mapping relation is searched to get the supported biggest transmission block; the data quantity waiting for transmission in current cache is checked to determine the selected transmission block; based on the finally selected transmission block, the transmission format combination is set up, and the emission power value corresponding to the finally selected transmission block is calculated. Based on the base station dispatching information and under the premise of ensuring transmission quality, the utility model selects the highest transmission rate as soon as possible to decide the modulation mode and coding rate.

The invention provides a mobile monitoring device, a system and a monitoring method thereof. The current monitoring device can not satisfy an application requirement. By using the device, the system and the method of the invention, the above problem can be solved. The device comprises: a camera, which is used to collect on-site audio and video analog data and real-timely send to a coding module; the coding module, which is used to code the audio and video analog data to the digital data and respectively send to a local storage module and a wireless transmission mode; the local storage module, which is used to carry out local storage to the audio and video digital data; the wireless transmission mode, which is used to real-timely transmit the audio and video digital data to a monitoring center through a wireless network. In the invention, the audio and video data shot on scene can be coded and then is stored locally, besides that the coded audio and video data can be real-timely transmitted to the monitoring center through the wireless network. A law enforcement process can be conveniently real-timely monitored.

The invention discloses a video watermarking-based high-definition video encrypted transmitting method. In the method, a random number generated by a random number generator is taken as a video scrambling key; the video scrambling key is encrypted by adopting an RSA algorithm to ensure that the video scrambling key cannot be captured in the transmitting process; and the encrypted video scrambling key is taken as a watermark to be embedded into the encrypted video by using a least significant bit (LSB) algorithm so as to realize secure encryption of the high definition video. The invention has higher security and lower computational complexity, and ensures the transmission quality of the high definition video content on the premise of secure transmission.

A method for dispatching parallel transmission of stream media data includes setting a sending module on steam media server; setting a sending module and a receiving module separately on each node for receiving stream media data; defining parameters of rate of sending, packet size and number of sending, signal transmission time, time of data overtime and packet loss for father node on receiving module; sending command packet for distributing transmission task simultaneously to each father node according to their network property and their distribution ratio for holding maximum set distribution ratio while network stable transmission state is ensured .