37results about How to "Improve retransmission performance" patented technology

System and method for signaling control information in a multi-carrier communications system to transmit data. A preferred embodiment comprises demodulating a first carrier that is used for transmitting a control channel transmission, determining a second carrier that is used for transmitting a data channel transmission based upon the demodulated control channel transmission, and demodulating the second carrier to obtain the data channel transmission. Additionally, designs for multi-carrier receivers are provided.

The invention provides a data transmission method and device. The method comprises that a first transmission node sends a data signal which is sent for the first time to a second transmission node, the data signal comprises data of at least one transmission block, the transmission block comprises K code blocks, and the K code blocks belong to P code block sets; the first transmission node carries out packet coding on M code blocks in the P code block sets to obtain S calibration code block sets; the first transmission node generates a retransmission data signal and sends the retransmission data signal to the second transmission node; and when preset conditions are satisfied, the retransmission data signal comprises Q bits in the calibration code block sets at least. According to the invention, retransmission resource is effectively reduced under the condition that the amount of feedback information is not increased.

The invention discloses a rate matching method for finite length loop buffer of a turbo code, comprising the steps: turbo coding is carried out to data bits of an input data block, upon which the size of a one-dimensional finite length loop buffer is decided; the initial positions of hybrid automatic repeat request data packets appointed by a plurality of predefined redundancy version values are evenly or approximately distributed in the one-dimensional finite length loop buffer; a redundancy version value is selected from the predefined redundancy version values in line with times of the hybrid automatic repeat requests; then data bits with specific length are read in turn from the initial position of hybrid automatic repeat request data packets appointed by the selected redundancy version values, thus a hybrid automatic repeat request data packet is formed and then sent out. The invention has the advantages of reduced size of circular buffer and improved repeat performance of hybrid automatic repeat request data packet.

A transmission control method for HARQ is provided for improving HARQ performance in a mobile communication system. The transmission control method for Hybrid Automatic Repeat reQuest (HARQ) in a mobile communication system according to the present invention includes receiving an downlink resource assignment message; determining whether configured downlink assignment has been indicated to an HARQ entity since a previously received downlink assignment for a User Equipment's (UE's) Cell-Radio Network Temporary Identifier (C-RNTI) for the same HARQ process; maintaining, if the configured downlink assignment has not been indicated to the HARQ entity, the HARQ process; and processing, if the configured downlink assignment has been indicated to the HARQ entity, the downlink resource assignment message as a resource assignment message for initial transmission.

The invention relates to a retransmission method used in characteristic wave beam shape sending multi-input multi-output communication system, which comprises: following steps: the receiver, based on the signal channel stat character, forms a character wave beam group with several character wave beams to feedback them to the sender; the sender, based on feedback character wave beam group, selects character wave beam via following methods as sending wave beam that when sending non-retransmission data, using best character wave beam as fixed sending wave beam; when sending retransmission data, in different transmission cycles, selecting the character wave beam different from the best one as the sending wave beam; and the sender, based on selected sending wave beam, forms relative data into wave beam to be sent by the antenna.

Provided is a method for retransmission in a terminal and a base station, the method including: receiving a data burst transmitted by occupying at least one subframe from the other one of the terminal and the base station; determining a transmission timing for transmitting a feedback signal based on a value, determined by transmission information of the data burst including the number of subframes occupied by the data burst, and a frame offset; transmitting the feedback signal to the other one of the terminal and the base station at the transmission timing; and if an NACK message is included in the feedback signal, receiving the data burst retransmitted from the other one of the terminal and the base station.

The invention discloses a method and device for retransmitting an uplink data stream. The method comprises the steps that UE receives an HARQ acknowledging character which is fed back by a base station and comprises the situation of whether data stream transmission is correct or not when the data stream is transmitted before by the UE; when the UE determines the situation that data stream retransmission needs conducting according to the HARQ acknowledging character, transmission conditions in the retransmitting process are acquired when data stream retransmission is conducted in a next-time HARQ circular time; the UE transmits the uplink data stream to the base station according to the transmission conditions, and carries the indications of whether the data stream carried by a data channel corresponding to a control channel are intersected or not according to an auxiliary E-DPCCH. According to the method and device for retransmitting the uplink data stream, when the UE conducts uplink data stream retransmission, a proper transmission mode and a data channel for carrying the retransmission data stream can be selected according to the transmission conditions in the retransmission process so as to ensure that the base station is informed of the carrying situation of data stream retransmission, and accordingly the UE can adapt with the current transmission conditions of a system, and the retransmission performance of the system can be improved.

A method for driving a retransmission timer in a mobile telecommunications system using a radio link protocol. A mobile telecommunications system receives a frame transmitted from a transmitter and, if the received frame is determined to be erroneous, requests the transmitter to retransmit the frame and drives a retransmission timer. In this case, there is a probability that the retransmission timer will be held. For this reason, the method for driving the retransmission timer minimizes that probability. Accordingly, the retransmission timer expires earlier by a period of time for which it is not held, thereby allowing subsequent operations in the mobile telecommunications system to be performed quickly and at an improved data rate.

The invention relates to the field of communication, in particular to a reliable broadcasting method for a hybrid traffic system with formation as the center. According to the method disclosed in theinvention, a wireless basic service set is formed by taking unmanned formation as a center. Formation vehicles use a TDMA protocol, and other vehicles use a CSMA/CA protocol. According to the method disclosed in the invention, a part of formation members are selected as CTS responders in a basic service set; the RTS/CTS function is realized for broadcast communication of a free vehicle driven by aperson, an RTS/CTS mechanism is introduced for broadcast communication, so that the broadcast communication can have a retransmission capability, and the reliability of the broadcast communication isimproved. According to the method, the topological structure characteristics in the hybrid traffic system are fully utilized, the performance loss caused by collision in wireless communication can begreatly reduced, and therefore the network communication efficiency is improved.

A radio communication apparatus having a retransmission function includes a pattern storing unit configured to store a correspondence between resource blocks used for a transmission packet and resource blocks used for a retransmission packet; and a packet scheduling unit configured to arrange the retransmission packet based on the correspondence.

The embodiment of the invention discloses a data packet retransmission method and device, electronic equipment and a storage medium. The method comprises the following steps: receiving a transmission request for transmitting a data packet in a current period; judging whether the transmission time of uploading each data packet to the cache queue is greater than or equal to a preset enqueue time threshold; if the transmission time of the data packet is greater than or equal to a preset enqueue time threshold value, the data packet is retransmitted; the method comprises the following steps: receiving a data packet, transmitting the data packet to a client, carrying out retention verification on the data packet of which the transmission time is less than a preset enqueue time threshold, uploading the data packet meeting the retention verification to the client according to the serial number of each data packet, clearing the data packet not meeting the retention verification, and retransmitting the data packet not meeting the retention verification; wherein the data packets which do not meet the retention verification are the data packets with the minimum serial number, the retention time of which is greater than or equal to a preset retention time threshold value, and the data packets with the retention time greater than the minimum serial number. The effect of retransmitting the lost data packet is achieved, and the user experience is improved.

The invention provides a method of HARQ in a MIMO spatial multiplexing system. The method comprises the following steps: after a plurality of independent data streams are transmitted, one or a plurality of data streams requiring re-transmission are selected according to information fed back by user equipment; the selected one or a plurality of data streams requiring re-transmission are subject to independent coding modulation respectively, and are transmitted by the mode of space diversity. The invention also provides a device of HARQ in the MIMO spatial multiplexing system, which comprises an information source module, one or a plurality of modulators and one or a plurality of coders, as well as a selective re-transmission control module and a diversity re-transmission module. Therefore, by adopting the method and the device, re-transmission gain of error data stream can be improved by space time-frequency selective diversity re-transmission, average re-transmission times of the system can be reduced, and throughput of the system can be improved.

Devices, methods and computer programs for adaptively selective retransmissions in wireless communications are disclosed. The invention allows enhancing short packet data retransmission performance under short delay constraints. Using a retransmission indication for at least one segment of consecutive FEC encoded bits reduces feedback signaling overhead compared to signaling retransmission requests individually for each of the coded bits. Accordingly, active HARQ transmissions with low amounts of feedback information are enabled.