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

Method for computing and transmitting channel quality information in a multi-carrier communications system. A preferred embodiment comprises receiving a transmission from a transmitter, wherein the transmission occurs over a plurality of carriers, measuring a channel condition for each carrier in a plurality of carriers, computing a channel quality indicator based upon the measured channel condition, and providing the channel quality indicator to the transmitter. The channel quality indicator can be used at the transmitter to schedule transmissions to various users in the multi-carrier communications system to maximize utilization of the carriers as well as overall network performance.

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.

Method for exploiting frequency diversity in a multi-carrier communications system to improve retransmission performance. A preferred embodiment comprises receiving the request for retransmission, formatting data for the retransmission, selecting a carrier from a plurality of carriers, and transmitting the retransmission on the selected carrier. The selected carrier may be different from a carrier used transmit the damaged transmission, thereby frequency diversity is exploited to change the probability of successful transmission in the retransmission. Alternatively, the retransmission may take place at a later time, to permit changes in the selected carrier to take place and obtain frequency diversity via the changed carrier.

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.

Method for packet transmission scheduling in a multi-carrier communications system. A preferred embodiment comprises selecting a set of users from a group of users who are targets of intended transmissions, wherein the selection is based upon channel quality information, determining a set of transmission parameters for each user in the set of users, and scheduling transmissions to the set of users. The channel quality information, which can be provided by the users of the multi-carrier communications system, can permit the exploitation of frequency diversity inherent in the multi-carrier communications system to increase system capacity to beyond a simple sum of carrier transmission bandwidth.

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.

The invention relates to a wireless reliable broadcasting method based on a random linear network code. The wireless reliable broadcasting method comprises two stages: broadcasting an original data packet and retransmitting a coding packet, namely, performing a linear network code on a lost data packet, and retransmitting the coding packet; and respectively solving each lost original data packet by utilizing a Gaussian elimination method after each receiving node receives the coding packets with the preset amount. The method in the invention can be used for overcoming the defect that a traditional retransmission method is not suitable for point-to-multipoint broadcasting scene and also prevents limitation that performance is not stable and system expense is large in the retransmission method based on XOR (exclusive OR) coding, according to the wireless reliable broadcasting method based on the random linear network code, disclosed by the invention, linear network code and retransmission is carried out on the lost original data packet of each receiving node through lower coding algorithm complexity and system expense; and the receiving node can be used for solving the original data packet from the coding packet by utilizing a solution of a linear equation system, and the retransmission performance of wireless broadcast is modified, and the average retransmission times is reduced. The wireless reliable broadcasting method disclosed by the invention is stable, is not influenced by data package loss distribution and has good promotion application prospect.

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.

An apparatus comprises a detection processor (203) for detecting retransmission feedback messages in response to a detection threshold. A threshold processor (207) determines the detection threshold in response to a noise estimate generated by a noise processor (209). The noise processor comprises a sub-symbol generator (211) which divides a retransmission feedback symbol into a plurality of sub-symbols. Each of the sub-symbols is despread by a spreading code with a lower spreading factor than a spreading factor of the retransmission feedback symbol. A difference generator (213) then generates difference symbol values between the plurality of sub-symbols and a noise estimator (215) generates the noise estimate in response to the difference symbol values, for example by determining the variance of the difference symbol values. An improved noise estimate may be determined resulting in improved detection performance and thus improved retransmission performance.

The invention discloses a speed matching method of the limited-length circular cache of a low-density parity-check code. The method includes the following steps of conducting a structured low-density parity-check code encoding on the data bit of an inputted information block, and determining the size of the one-dimensional limited-length circular cache according to the encoding result; selecting a redundant version value from a plurality of preset redundant version values according to the retransmission times of the mixed retransmission request, and determining the initial position of the data bit of the formed mixed retransmission request data packet read from the one-dimensional limited-length circular cache according to the selected redundant version value; and reading the mixed automatic retransmission request data packet composed of specific-length data from the initial position in order, and sending the mixed automatic retransmission request data packet out. The respective corresponding initial positions of the multiple preset redundant version values are evenly or almost evenly distributed on the one-dimensional limited-length circular cache.

A base station (103) operates a hybrid retransmission scheme for a communication to a first subscriber unit (101) over a communication channel of an air interface of a cellular communication system. The base station (103) comprises a retransmission parameter controller (209) which sets a transmission parameter, such as a transmit power or an error correcting scheme, for a transmission of the communication in response to an operating point for the retransmission scheme. A CQI processor (203) determines a channel quality indication for the communication channel and a variation processor (205) determines a variation measure of a variation of the channel quality indication. The variation measure can for example be a rate of change. An operating point controller (207) sets the operating point in response to the variation measure. The invention may allow improved setting of transmission parameters for initial transmissions thereby providing higher throughput, reduced resource consumption and reduced delay.

This invention discloses an adaptive re-transmission method in a multi-antenna communication system at the receiving end including: testing if there are error codes needed to be re-transmitted in the received sub-flows, computing the ratio of equivalent signals and the interference noise of the being re-transmitted sub-flows after MIMO test, comparing the ratio with a pre-set threshold value, if the ratio is smaller than the pre-set threshold, then all the sub-flows to be re-transmitted are re-transmitted, if the ratio is greater than the preset threshold value, then the sub-flows necessary to be re-transmitted should be processed by increment redundant re-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.

A technology of dynamically allocating uplink and downlink subframes in an LTE-advanced Time Division Duplex (TDD) communication system specifically relates to a TDD adaptive frame structure retransmission method, network and terminal side device. The method includes: in a TDD adaptive frame transmission process, for an uplink subframe, if a frame structure whose Round Trip Time (RTT) period of a Physical Hybrid-ARQ Indicator Channel (PHICH) and a Physical Uplink Shared Channel (PUSCH) corresponding to the uplink subframe is 10 ms is found in seven already defined frame structures, transmitting PHICH data on a corresponding downlink subframe in the found frame structure, and receiving retransmitted data on the corresponding uplink subframe in the found frame structure. The technical solution of the present application ensures the Hybrid Automatic Repeat Request (HARQ) compatibility with an uplink data channel of an R10UE.

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.

An apparatus comprises a detection processor (203) for detecting retransmission feedback messages in response to a detection threshold. A threshold processor (207) determines the detection threshold in response to a noise estimate generated by a noise processor (209). The noise processor comprises a sub-symbol generator (211) which divides a retransmission feedback symbol into a plurality of sub-symbols. Each of the sub-symbols is despread by a spreading code with a lower spreading factor than a spreading factor of the retransmission feedback symbol. A difference generator (213) then generates difference symbol values between the plurality of sub-symbols and a noise estimator (215) generates the noise estimate in response to the difference symbol values, for example by determining the variance of the difference symbol values. An improved noise estimate may be determined resulting in improved detection performance and thus improved retransmission performance.

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.

A base station (103) operates a hybrid retransmission scheme for a communication to a first subscriber unit (101) over a communication channel of an air interface of a cellular communication system. The base station (103) comprises a retransmission parameter controller (209) which sets a transmission parameter, such as a transmit power or an error correcting scheme, for a transmission of the communication in response to an operating point for the retransmission scheme. A CQI processor (203) determines a channel quality indication for the communication channel and a variation processor (205) determines a variation measure of a variation of the channel quality indication. The variation measure can for example be a rate of change. An operating point controller (207) sets the operating point in response to the variation measure. The invention may allow improved setting of transmission parameters for initial transmissions thereby providing higher throughput, reduced resource consumption and reduced delay.

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.

The present invention provides a data transmission method and device; the method includes: the first transmission node sends a data signal transmitted for the first time to a second transmission node, wherein the data signal includes data of at least one transmission block, so The transmission block includes K code blocks, and the K code blocks are divided into P code block sets; the first transmission node performs packet coding on the M code block sets in the P code block sets, to obtain S sets of check code blocks; the first transmission node generates a retransmission data signal and sends it to the second transmission node; when a predetermined condition is met, the retransmission data signal at least includes the check code block Q bits in the set. The invention can effectively reduce the resources used for retransmission without increasing the quantity of feedback information.

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 hybridautomatic repeat request data packet.

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.