235results about How to "Reduce retransmission" patented technology

A radio base station includes multiple antennas associated with a cell. Multiple mobile radios are selected to receive transmissions over a shared radio channel during a predetermined time interval. Information is transmitted over the shared radio channel to multiple mobile radios in the cell during the predetermined time interval using multiple antenna beams. As a result, interference from the transmission appears as white additive Gaussian noise in time and in space in the cell. A “flashlight effect” caused by a single beam transmission over the shared channel during a predetermined time interval that would normally detrimentally impact mobile channel quality detection is avoided. Other methods for avoiding the flashlight effect are described.

A MAC method has three procedures: a prioritization procedure, a collision resolution procedure, and a polling procedure. The prioritization procedure employs the handshaking method to ensure that a high priority station can join the polling list earlier than a low priority station. The collision resolution procedure employs a tree-splitting algorithm to ensure all active stations that underwent the prioritization period can join the polling list in a bounded time. In the polling procedure, the AP allocates the TXOP for each admitted station and schedules the transmission order of all admitted stations. In addition, the AP broadcasts the schedule information in the V-POLL frame. A power-saving station can wake up at the start of the contention-free period. To conserve power, on inspecting the V-POLL frame, if a PS station finds that it cannot transmit nor receive data frames during the polling period, then that station may return to the doze state.

The invention discloses an uplink ACK / NACK bundling transmission method. The method comprises steps: A, the terminal determines downlink sub frames demodulated continuously and correctly in a feedback window and feeds ACK / NACK information back in the corresponding uplink resources according to continuity of a value descried in the specification indicated by the downlink control information (DCI) formats 1 / 1A / 1B / 1D / 2 / 2A / 2B and semi-static scheduling configuration information; and B, the base station detects the ACK / NACK information fed back by the terminal, judges the downlink sub frames demodulated continuously and correctly by the terminal and carries out new transmission on other downlink data assignment besides the downlink sub frames demodulated continuously and correctly in the feedback window. The invention also discloses a terminal and a base station. When the technical scheme of the invention is applied, the data transmission efficiency is improved, and accuracy of judging missing of sub frames, incorrect sub frame demodulation and correct sub frame demodulation can be improved.

A wireless feeder network comprises feeder base stations coupled to the communications network and feeder terminals coupled to associated access base stations of the access network. A group of wireless network components form elements of a feeder cluster and the elements of the feeder cluster are connected by an additional communications resource configured to be operated in parallel with the wireless resource of the wireless feeder network. Both a primary and secondary element of the feeder cluster seek to decode at least one resource block allocated to the primary element for reception of data. Information derived from the secondary decoded data is transmitted from the secondary element to the primary element via the additional communications resource. The primary element then performs a revised decoding process additionally using the information received from said secondary element to improve its own decode probability.

The invention provides a real-time stream media transmission terminal and a real-time stream media transmission method based on a multi-connection technology. The terminal is formed by additionally installing a signaling control unit and a media transmission unit on the basis of a single-connection terminal, the signaling control unit is in charge of completing the negotiation and the building of a multi-connection link, and the media transmission unit is in charge of completing the receiving and sending transmission function of the media. The real-time stream media transmission terminal and the real-time stream media transmission method have the innovation advantages that the multi-connection data transmission building possibility is improved, so the resource utilization rate and the transmission efficiency are improved, and more data can be transmitted in shorter time. In addition, through a jamming control algorithm, a flow rate distributing dispatching algorithm and a connection quality evaluation algorithm based on RTPs (real time protocols) and RTCPs (real-time transmission control protocols) adopted in the method provided by the invention, the data transmission speed can be obviously accelerated, the time delay is reduced, and the unnecessary fast re-transmission is reduced, so the experience effect of users is obviously improved.

A method and system for sharing over-allocated bandwidth between different classes of service in a wireless network. Traffic is transmitted for a first service class in excess of bandwidth allocated to the first service class using unused bandwidth allocated to a second class. After transmitting traffic for the first service class in excess of bandwidth allocated to the first service class using unused bandwidth allocated to a second class, traffic for a third service class is transmitted in unused bandwidth remaining in the second service class.

A method and apparatus for using a multi-user detector for reducing multiple access interference (MAI) in a direct sequence CDMA wireless system such as W-CDMA. A superconducting rapid single flux quantum (RSFQ) RF digital receiver operating in combination with an RSFQ successive interference canceller (SIC) is located in the base stations of the wireless system. In the present invention, the RSFQ SIC is a vector machine capable of processing the cross-correlation matrices using an iterative method to decorrelate the user binary code sequences from the input signal in which the interference components are removed. According, the reduction in interference results in a significant increase in system capacity while improving cellular coverage area.

A radio base station includes multiple antennas associated with a cell. Multiple mobile radios are selected to receive transmissions over a shared radio channel during a predetermined time interval. Information is transmitted over the shared radio channel to multiple mobile radios in the cell during the predetermined time interval using multiple antenna beams. As a result, interference from the transmission appears as white additive Gaussian noise in time and in space in the cell. A “flashlight effect” caused by a single beam transmission over the shared channel during a predetermined time interval that would normally detrimentally impact mobile channel quality detection is avoided. Other methods for avoiding the flashlight effect are described.

The present invention relates to a packet retransmission method of a terminal accessing a base station in contention-based access mode, and the method includes transmitting an uplink packet to the base station; receiving, when the base station fails decoding the uplink packet, a retransmission request message transmitted by the base station; and initiating, when the retransmission request message is received, a Radio Link Control (RLC) retransmission. According to the present invention, the terminal operating in contention-based access mode initiates RLC retransmission in reception of an HARQ NACK from the base station. Accordingly, it is possible to perform the RLC retransmission immediately without necessity of waiting for the expiry of HARQ RTT as in the HARQ retransmission, resulting in reduction of packet retransmission delay.

A method for uplink synchronization of a first transceiver and a second transceiver in a multi-user cellular communication system having communication resources divided into communication channels. The method includes the following steps. A first signature sequence is transmitted from the second transceiver to the first transceiver, where the signature sequence is selected from a first set of signature sequences. In the first transceiver, the received signal is correlated with at least one signature sequence from a second set of signature sequences to estimate the time of arrival of the signature sequence to synchronize transmission between the second transceiver and the first transceiver. In transmitting the first signature sequence from the second transceiver to the first transceiver, the first signature sequence constitutes at least part of a zero-correlation zone sequence.

A method for communicating in a wireless communications system includes receiving an indicator indicating a utilization of network resources for carrying an acknowledgement information, and determining whether the station is permitted to transmit a packet. The method includes when the station is permitted to transmit the packet, determining a first location of a first network resource in accordance with the indicator, and transmitting the packet at the first location of the first network resource.

A time synchronization method in a wireless sensor network, a low power routing method using a reservation scheme, and an apparatus for performing the method are provided. The time synchronization method in the wireless sensor network may include: receiving a first synchronization request command packet from a parent node that manages time synchronization for a predetermined synchronization region; receiving, from the parent node, a second synchronization request command packet that has a transmission timestamp value of the first synchronization request command packet; and performing time synchronization for a child node based on a reception time of the first synchronization request command packet, a reception time of the second synchronization request command packet, and the transmission timestamp value of the first synchronization request command packet.

The embodiment of the invention discloses a method, a device and a system for combined use of wireless fidelity (WiFi) access point equipment. The method comprises the following steps that: when first WiFi access point equipment detects that a communication interface communicates with second WiFi access point equipment, the first WiFi access point equipment acquires channel information of the second WiFi access point equipment and sets a current channel of the first WiFi access point equipment to be consistent with a channel of the second WiFi access point equipment; and the first WiFi access point equipment is combined with the second WiFi access point equipment for use. The distance between the first WiFi access point equipment and the second WiFi access point equipment can be regarded to be smaller than a certain set distance limit value when the first WiFi access point equipment and the second WiFi access point equipment communicate with each other, so that within the distance limit value, interference between the first WiFi access point equipment and the second WiFi access point equipment on the same channel is obviously smaller than interference between the first WiFi access point equipment and the second WiFi access point equipment on different channels; therefore, through the same-frequency operation of the embodiment of the invention, mutual interference during near-distance combined use can be reduced.

A method for reducing unnecessary retransmissions due to transmission delays in a wireless network environment, comprising: measuring a packet inter-arrival time with respect to a received data packet; transmitting an acknowledgement packet corresponding to the data packet received at the packet inter-arrival time in excess of a first threshold time when the measured packet inter-arrival time exceeds the first threshold time; and suspending transmission of an acknowledgement packet corresponding to a new data packet when a data packet received after having transmitted the acknowledgement packet is the new data packet that has not previously been received.

The embodiment of the invention discloses a method and equipment for transmitting ACK / NACK information. By adoption of the technical scheme disclosed by the embodiment of the invention, for terminal equipment configured with a plurality of downlink carriers, a transmission scheme for feedback of ACK / NACK information when the terminal equipment only receives data on a downlink main carrier is provided; and therefore, on the condition of guaranteeing normal working of the terminal equipment, the excessive merging of the feedback information is avoided during the feedback of the ACK / NACK information, the unnecessary information retransmission is reduced and the transmission performance of the system is improved.

The invention relates to a wireless device component and a communication method of the wireless device component. The wireless device component comprises a master wireless device and a slave wirelessdevice which can be in wireless communication with each other, and the master wireless device is configured to establish a wireless link with another device and transmit related parameters to the slave wireless device, so that the slave wireless device monitors and receives a wireless signal from the other device; Wherein the first wireless device is configured to send a correction packet to the second wireless device for correcting audio data in the audio data packet received by the second wireless device under the condition that the first wireless device correctly receives the audio data packet, and the form of the initial correction packet and / or the form of the subsequent correction packet can be adjusted according to the acquisition condition of the audio data packet by the second wireless device. According to the method and the device, the capacity of obtaining correct audio data is improved while the data transmission quantity between the devices is remarkably reduced, the powerconsumption and the data transmission time are reduced, the reliability of wireless transmission between the wireless devices and between the wireless devices and another device is improved, and theretransmission of the audio data packets by another device is reduced.

The invention relates to a high-reliability binaural wireless earphone and a communication method applied to the binaural wireless earphone. The binaural wireless earphone comprises a master earphoneand a slave earphone, wherein the master earphone establishes a bluetooth link with another equipment so as to carry out bluetooth communication with the equipment and transmits related parameters ofthe bluetooth link to the slave earphone so as to enable the slave earphone to listen for bluetooth signals from the equipment. One of the earphones is configured to send an error correction code frame to the other earphone at least in the cast of correctly receiving a bluetooth audio data frame, wherein the error correction code frame includes an error correction code under the condition that oneearphone correctly receives the bluetooth audio data frame. According to the wireless earphone and the communication method, the ability of the wireless earphone to receive the bluetooth audio data frame from another equipment can be improved, and the reliability of bluetooth transmission is enhanced; the retransmission of the other equipment for the audio data frame is reduced; and the synchronization of the master earphone and the slave earphone in bluetooth data frame reception can also be improved so as to optimize the stereo effect.

A CPU 41 of a server device 40 measures an elapsed time after transmitting a data segment, and suspends measuring time upon receiving an acknowledgement segment for the data segment. CPU 41 transmits a data segment whose elapsed time has reached a retransmission timeout value. CPU 41 sets, as a retransmission timeout value of a data block, a time value determined according to a monotonically increasing function of a number of transmissions of the data block, during a given time period after the second-time transmission of the data block, while CPU 41 sets a time value which is predetermined and is different from the time value determined by the monotonically increasing function during a period between the first-time transmission and immediately before the second-time transmission of the data block.

Disclosed is a technique for mitigating the effect of an in-band interferer in Orthogonal Frequency Division Multiplexing (OFDM) wireless or wired networks that employ soft decision Viterbi decoder in the physical layer. The technique uses an independent estimation of the signal quality, which is passed to the Viterbi algorithm decoder so that it is able to discard the corrupted subcarriers. This improves the error correction capability of the Viterbi algorithm decoder in a receiver, which leads to fewer retransmissions and into higher information throughput.

A method and system for sharing over-allocated bandwidth between different classes of service in a wireless network. Traffic is transmitted for a first service class in excess of bandwidth allocated to the first service class using unused bandwidth allocated to a second class. After transmitting traffic for the first service class in excess of bandwidth allocated to the first service class using unused bandwidth allocated to a second class, traffic for a third service class is transmitted in unused bandwidth remaining in the second service class.

A method of a wireless communication device adapted to perform device-to-device communication is disclosed. The method comprises transmitting an indication of device-to-device communication capability to a network node, receiving one or more beacon parameters allocated to one or more second wireless communication devices adapted to perform device-to-device communication, monitoring device-to-device communication beacon signaling based on the received beacon parameters, and performing at least one radio operation task based on measurements of the monitored device-to-device communication beacon signaling. The at least one radio operation task may comprise using the measurements of the monitored device-to-device communication beacon signaling to select or re-select one of the one or more second wireless communication devices for device-to-device communication, and / or transmitting a beacon measurement report to the network node based on the monitored device-to-device communication beacon signaling. Another method of a wireless communication device comprises receiving one or more beacon parameters allocated to the wireless communication device from a network node, transmitting device-to-device communication beacon signaling based on the received beacon parameters, and receiving a beacon measurement report from the network node indicating detection of the transmitted beacon by one or more second wireless communication devices. Corresponding methods of a network node are also disclosed as well as corresponding arrangements, wireless communication devices and network nodes.

A data transmission system includes a server, a network and a plurality of terminals. The server sends data to the terminals via the network and the network connects the server and the plurality of terminals, and the terminal includes a network interface unit that connects to the network and communicates with the other terminals or the server via the network, a storage unit that stores reception data and information on missing of data, a detection unit that detects that the reception data is missing or damaged, and a controller that controls the network interface unit to send a repair request message to the other terminals through multicast when the detection unit detects missing or damaged data of data received from the server, and that controls the network interface unit to send a repair request message to the server when there is not requested data in the other terminals.

The invention provides a system whereby a node can configure itself automatically with an address when it joins or establishes a network. Once the network is established, the nodes within that network exchange hello messages that are modified to give an indication of the network to which the nodes belongs. If two networks begin to merge with each other then the nodes at the edge of that network will receive hello messages from nodes which identify two different networks. When this occurs, the node can determine that network merging is occurring and carry out the process of duplicate address detection to ensure the uniqueness of its address within the entire combined network.

A system and method for upgrading service class of a connection in a wireless network includes identifying a congested CoS in a sector of a wireless network. Bandwidth availability in the sector is determined at an enhanced CoS in relation to the congested CoS. A communications session is selected in the congested CoS for upgrading. The communications session is upgraded to the enhanced CoS.

The invention relates to a particles-impact damper with an elastic support. The inner part of the particles-impact damper is provided with an elastic energy-storage component and a plastic impact energy-dissipation component. The invention is characterized in that the particles-impact damper is connected with a controlled main system through the elastic support and the natural vibration frequency of the particles-impact damper is not greater than that of the controlled main system. The elastic support can be a spiral spring, a plate spring or an elastic cushion; and free movement direction of the elastic support is identical to the vibration direction of the controlled main system. The particles-impact damper can effectively reduce acceleration in impact process and decrease impact on the controlled main system so as to consume vibration energy of the controlled main system to the maximum extent, reduce the energy retransmission to the controlled main system and alleviate the impact of ultraharmonics and subharmonic. The particles-impact damper can be applied to the vibration control of nonlinear systems with low frequency and dense modes.

The invention discloses a coexistence method for a WIA-PA network and an IEEE 802.15.4 network and relates to an industrial wireless sensor network. Gateway equipment in the WIA-PA network learns and acquires the data packet transmission cycle of the IEEE 802.15.4 network by snooping a beacon frame transmitted by an IEEE 802.15.4 interference network; and a WIA-PA network system manager adjusting the scheduling time of the network equipment by redistributing the network resource so as to avoid interference. According to the coexistence method, the spectrum resources of the network can be utilized completely and communication reliability and stability of the WIA-PA network can be improved effectively.

Systems and methods for improving network performance. A method of transmitting packet data across a network includes a transmitting network device establishing a reservation to transmit traffic to a plurality of wireless receiving network devices across a network; the transmitting network device transmitting a sequence of packets across the network, wherein a packet of the sequence of packets includes data requesting the receivers acknowledge receipt of the packet; the transmitting network device waiting for a predetermined time to receive acknowledgement of receipt of the packet from the wireless receiving network devices; the transmitting network device retransmitting a packet across the network only if it does not receive an acknowledgement for that packet from any of the wireless receiving network devices within the predetermined time.

The invention discloses a wireless sensing network route method based on multi-gateway data transmission. The method involves, through calculating work states of gateways, selecting a final target gateway and determining a final flow direction of a data flow, realizes data transmission from a current sending node to the final target gateway through opportunity transmission, reduces data packet concentration and vast packet loss which are caused by work failure of the gateways, and improves the correction transmission rate of data packets. Besides, the maintenance is stable, the cost is effectively reduced and controlled, and the network life cycle is prolonged.

A communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT) is provided. The method includes intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services.The disclosure provides a packet processing method of a transmitter that include transmitting a radio link control (RLC) service data unit (SDU) to a receiver; receiving, from the receiver, a first message including information about whether the RLC SDU is successfully transmitted; and transmitting a first indicator indicating successful transmission of the RLC SDU from an RLC entity of the transmitter to a packet data convergence protocol (PDCP) entity of the transmitter when the receiver receives the RLC SDU.

The invention discloses an audio / video transmission method on the basis of a 3G (3rd Generation) network, relates to the technical field of the 3G network audio / video transmission method and overcomes the technical defects of high error rate and high delay rate of an existing TCP (Transmission Control Protocol) communication protocol in the transmission process. A client and a server carry out audio / video transmission by utilizing a UDP (User Datagram Protocol) protocol. The audio / video transmission method is characterized in that a sliding window mechanism is adopted and comprises the following steps: in case of the change of the ACK (Acknowledgement) recurrence frequency, forecasting that a congestion criticality is reached and entering a congestion avoidance phase in advance before a packet is lost; and after entering the congestion avoidance phase, adopting a formula of WND=BEW*RTT to calculate an approximately same theoretical window, ensuring a sending window not smaller than the theoretical window and controlling transmit flow to carry out congestion control. In the step of entering the congestion avoidance phase in advance, the congestion control is mainly carried out by measuring RTT (Round-TripTime) at both ends, carrying out conversion on the channel capacity and controlling the transmit flow. The audio / video quality is obviously improved; the delay time is shortened into 2 seconds from the maximum delay seconds; and the audio / video quality is obviously improved.