147results about How to "Improve retransmission efficiency" patented technology

The invention provides a feedback method and device. The method comprises that a first transmission node receives a signal which includes a transmission block and is sent by a second transmission node, the transmission block comprises K code blocks, and the K code blocks belong to P code block sets; the first transmission node obtains the states of the P code block sets according to the signal including the transmission block; according to the states of the P code block sets, the first transmission node determines at least one type of feedback information in a preset feedback information set, and the feedback information set comprises correct indication information and n types of wrong indication information at least; and the first transmission node sends the determined feedback information to the second transmission node. According to the information, the amount of retransmitted data can be effectively reduced, and the efficiency of data retransmission is improved.

The invention provides a data retransmission method and system. The method comprises the following specific steps: after receiving K original data packs, performing packet-loss detection by the receiving terminals and sending feedback report to the sending terminal when detecting packet-loss, wherein the feedback report contains packet-loss information of the receiving terminal and K is a naturalnumber; after sending W original data packs, generating a combined pack through network coding according to the received packet-loss information of all the receiving terminals by the sending terminal, wherein W is a natural number; and retransmitting the combined pack by the sending terminal. The method and system of the invention can be used to increase the data retransmission efficiency of wireless broadcast.

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.

A method of retransmitting of a lost packet in a mobile communication system in which multiple copies plus delays occur i.e. after a transmitter has received from a receiver a negative acknowledgement (NACK) signal, which points to a specific data packet, multiple copies of the specific data packet are retransmitted with a delay, which is inserted between two consecutive copies. The number of multiple copies can be acquired by a linear or exponential calculation according to the current number of retransmission. The specific retransmission method may be the interleaving transmission method, which transmits a retransmission queue in the interleaving retransmission interval; or the multiple queues polling transmission method, which transmits the retransmission queue by copy queues sequence. In the correlated fading channels, the method of the present invention can decrease the number of retransmissions, and at the same time it can increase efficiency of each retransmission.

The invention relates to an HARQ configuration method and feedback method, a base station and user equipment. The configuration method comprises the following steps: sending indication information to the user equipment so as to indicate a basic confirmation information transmission channel, wherein the basic confirmation information transmission channel is suitable for the user equipment to feed back basic confirmation information, and the basic confirmation information includes any one of ACK or NACK; transmitting data including multiple blocks to the user equipment; when the basic confirmation information including the NACK is received, sending expanded NACK authorization information to the user equipment, wherein the expanded NACK authorization information is suitable for indicating the user equipment to transmit channel resources of an expanded NACK; and receiving the expanded NACK transmitted by the user equipment according to indication of the expanded NACK authorization information, wherein the expanded NACK includes incorrect block information; and retransmitting incorrect blocks to the user equipment. By utilizing the scheme, the utilization rate of communication resources can be increased.

The invention discloses a method and device for processing an acknowledgement (ACK) / negative acknowledgment (NACK) feedback bit. The method comprises the following steps: user equipment (UE) receives data in N downlink carriers and M downlink subframes; when determining that semi persistent schedule (SPS) physical downlink shared channel (PDSCH) transmission which does not correspond to a physical downlink control channel (PDCCH) does not exist in one downlink carrier, or SPSPDSCH transmission which dose not correspond to the PDCCH exists in one downlink carrier, and the receiving the PDCCH of which the downlink allocation index (DAI) value is equal to M, the UE carries out mapping on the ACK / NACK feedback information of the downlink carrier by adopting a first class mode; and when determining that the SPSPDSCH transmission which does not correspond to the PDCCH exists on the downlink carrier, and receiving no PDCCH of which the DAI value is equal to M, the UE carries out mapping on the ACK / NACK feedback information of the downlink carrier by adopting a second class mode. According to the embodiment, when the UE loses the packets, the problem that the understanding of a base station is not consistent with the understanding of the UE for the ACK / NACK feedback information can be avoided, thus improving the reliability of the ACK / NACK transmission and the retransmission efficiency of a system.

A method for packet retransmission employing feedback information is disclosed. The method for packet retransmission employing feedback information comprises receiving reception acknowledgement information from a receiver after a transmitter transmits packets, the reception acknowledgement information representing channel status information and decoding success / failure of the packets; and changing a retransmission mode in accordance with the channel status information if the reception acknowledgement information represents decoding failure, and transmitting retransmission packets of the packets in accordance with the changed retransmission mode. Thus, it is possible to improve decoding probability of the receiver and increase efficiency of retransmission.

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.

The invention discloses a method and a device for determining ACK (acknowledgement) / NACK (negative Acknowledgement) feedback bit number, and an indicating method and an indicating device for determining the ACK / NACK feedback bit number, which are used for enabling a UE (user equipment) to dynamically determine the ACK / NACK feedback bit number according to a configured downstream carrier, an activated downstream carrier or an indicated downstream carrier set, so as to improve the transmission reliability and transmission efficiency of the ACK / NACK information. The indicating method for determining the ACK / NACK feedback bit number comprises the following steps: a substation determines the indication information, wherein the indication information is used for indicating the UE to determine the mode of the ACK / NACK feedback bit number; and the substation sends the indication information to the UE through a physical downstream control communication channel (PDCCH).

The invention discloses a message fragment sending method, device and network equipment. The method comprises the following steps: processing a message transferred from a transmission layer at an IP (Internet protocol) layer, wherein fragmentation operation is avoided from being carried out on the message in the processing process; processing the message processed at the IP layer at a data link layer, and delivering the message to a communication interface sending the message; comparing the length value of the message processed at the data link layer with a value of the MTU (maximum transmission unit) of the interface; and if the length value is greater than the value of the MTU, fragmenting the message processed at the data link layer according to the value of the MTU and sending through the communication interface. Compared with the prior art, the invention has the advantages that the flow of fragmenting and sending a relatively long message is simplified, and the problem that the system performance is influenced due to the excessive occupation of a CPU (central processing unit) and storage bandwidth by the fragments at the IP layer is avoided.

The method includes steps: (1) After orthogonal and frequency-division multiplex process, data are sent from the sending end (SE) to the receiving end (RE); (2) RE receives data, estimates channels, de-modulates, decodes and sends ACK / NACK and the position info of the re-sending data block to SE; (3) SE continues to send the new data after receiving ACK; (4) After receiving NACK, SE ascertains the data block which needs to be re-sent, then accumulates the number of re-sent data blocks. If this number is not larger than the max re-sent number, SE re-sends this data block. Otherwise, SE waives this data block and starts to send the new data of the next frame; (5) after receiving the re-sent data block, RE combines these data with the data received before and decodes them, then feedbacks a info to SE, then repeats steps (3) and (4). The invention raises re-sent efficiency, frequency utility and the system throughput.

A method and apparatus for controlling iterative decoding in a turbo decoder are provided, in which a maximum number of iterations is determined for current data to be decoded based on at least one of current HARQ information necessary for a HARQ operation of the current data, previous HARQ information about previous data, and early stop information indicating whether iterative decoding of the previous data was early stopped. A turbo decoder iteratively decodes the current data within the maximum number of iterations.

The invention discloses a method and device for transmitting messages. The method comprises the following steps: executing the transmit operation of messages according to the preset number of transmissions of a single message and the preset response time threshold of each transmission; counting the actual response time of each transmitted message in the current period; calculating the average value of the actual response times of all the transmitted messages in the current period, adjusting the number of transmissions of each message and the response time threshold of each transmission according to the calculated average value; and executing the next period of transmit operation of messages according to the adjusted number of transmissions and the adjusted response time threshold of each transmission. By using the method and device of the invention, the dynamic adjustment of the number of transmissions of messages and the response time threshold of each transmission can be realized according to the actual network communication state, thus increasing the retransmission efficiency of messages.

The invention discloses a data retransmission method, a receiving end and a system. The method comprises the following steps: receiving data packets transmitted by a transmitting end; when certain data packets in the data packets are lost, recording the serial number of a first lost data packet, using the serial number of the first lost data packet as the serial number of starting packet loss, and generating a corresponding packet loss bitmap of a preset length according to a packet loss situation after the first lost data packet; and generating selective retransmission information according to the serial number of the starting packet loss and the packet loss bitmap, and transmitting the selective retransmission information to the transmitting end in order that the transmitting end performs retransmission of specified data according to the selective retransmission information. Through adoption of the technical scheme provided by the invention, the problems of over large data packets for selective retransmission and low retransmission efficiency in a current data retransmission method can be solved.

The embodiment of the invention provides a method for ensuring service quality of live broadcast of a web television. The method includes the steps as follows: detecting a live broadcasting message received from an original multicast group; adding a multicast group corresponding to a delay multicast flow sent by a re-transmission server and receiving a delay re-sending message from the delay multicast flow; and recovering the live broadcasting message according to the received delay re-sending message. Correspondingly, the invention also provides a terminal and the re-transmission server. Theterminal can directly receive a message to recover in the delay message flow sent from the re-transmission server once detecting that an original message is lost or false, and does not need to send Nack information to the re-transmission server for requesting the re-transmission of data, therefore, Nack storm is avoided, the processing of the re-transmission server is simplified and the efficiency of the re-transmission is improved.

The invention provides a method and a system for realizing uplink retransmission of an access link. The method comprises the following step that: when an uplink subframe specified in a timing table preset in a time division duplexing (TDD) system cannot be used for performing the uplink retransmission from relay field user equipment (UE) to a relay station (RN), the RN adjusts the position of an uplink retransmission subframe and instructs the relay field UE to perform the uplink retransmission on other available uplink subframes through uplink retransmission attached indicating information. Due to the adoption of the method and the system, effective configuration of the uplink retransmission of the relay field UE is realized, the configuration flexibility of the uplink retransmission of the relay field UE is enhanced, and the efficiency, system resource utilization ratio and user throughput of hybrid automatic repeat request (HARQ) retransmission are improved.

The invention provides a local cooperation method in wireless multicasting. During multicasting to a user, a mobile base station is divided into four stages: a first stage: the mobile base station broadcasts a certain number of data packets to the user; a second stage: the idle non-multicasting user codes the received data packets in the network and then forwards the data packets to the multicasting user, and the multicasting user repairs the data packets first time by utilizing the forwarded data packets; a third stage: the user in the multicasting group retransmits the data packets in a cooperation manner, and the error packet list of the multicasting user is split by a network coding method to obtain a local retransmission strategy, and the local retransmission of the data packets is performed according to the strategy; and a fourth state: when receiving the report, the mobile base station judges whether the data packets are retransmitted or not according to the feedback of the user. By adopting the method, the retransmission request of the multicasting user to the mobile base station is reduced, the retransmission relay is reduced, the retransmission times are lowered, the retransmission efficiency is improved, the retransmission load of the mobile base station is lightened, the honeycomb link resource is saved, and the utilization rate of the wireless resource is improved.

The invention provides a message retransmission method and system. The method comprises the following steps: setting a retransmission time interval corresponding to any message to be retransmitted, wherein the retransmission time interval increases with the number of historical retransmissions; at the arrival of the retransmission time interval, performing a retransmission operation on any messageto be retransmitted; obtaining an operation status corresponding to the retransmission operation, and when the operation status is failure, updating the number of historical retransmissions, and whenthe number of historical retransmissions is smaller than a retransmission number threshold, and the number of messages to be retransmitted in a retransmission queue is smaller than a number threshold, adding any message to be retransmitted to the retransmission queue; and repeatedly executing the above steps, until the operation status is successful or the number of historical retransmissions reaches the retransmission number threshold or the number of messages to be retransmitted in the retransmission queue reaches the number threshold. By adoption of the method and system, invalid retransmission operation can be avoided, the retransmission efficiency is effectively improved, the operating pressure of the system is reduced while ensuring accurate delivery of the messages, and it is conducive to improving the overall performance of the system.

The invention discloses a multicast retransmission method based on network codes, and mainly solves the problem that the retransmission efficiency of the prior art is not high. The multicast retransmission method based on the network codes comprises the following steps: originating nodes broadcast data packets to destination nodes, the destination nodes carry out decoding to received signals and feed back the receiving status information of the data packets to the originating nodes, the originating nodes generate an originating end packet receiving status matrix according to the feedback information and then search matching groups by processing the matrix, the originating nodes carry out network code combination to the matching groups to generate combined groups and retransmit the combined groups, and each destination node carries out decoding to the received signals to acquire the retransmitted combined groups of the codes and recovers the lost group of each node from the combined groups. The multicast retransmission method based on the network codes can effectively reduce the average retransmission times of lost groups, obviously improves retransmission efficiency, and can be used for wireless multicast or broadcast network.

The invention discloses a synchronous non-self-adapting hybrid automatic repeat request (HARQ) method and a system. The method comprises: a transmitting end sends a data packet to a receiving end; the transmitting end receives a feedback error response message when error occurs at the cyclic redundancy check on the data packet by the receiving end; the transmitting end adjusts the transmitting bit of an HARQ data packet and transmits the HARQ data packet to the receiving end. By the above technical scheme, extra frequency diversity and time diversity can exist between the HARQ data packet and the initial transmission data packet so as to bring extra combined gain; under the condition of increasing no system cost, HARQ retransmission efficiency can be further improved.

The invention provides a data retransmission method which comprises the following steps that: after completely transmitting N data packets, a source node acquires a packet-loss model matrix of the N data packets, wherein N is a natural number; the source node analyzes the acquired packet-loss model matrix so as to obtain a combination mode of data packets to be retransmitted; and the source node carries out combined encoding on the data packets to be retransmitted according to the combination mode of the data packets to be retransmitted to obtain encoding packets to be retransmitted, and sequentially retransmits the encoding packets. Accordingly, the invention also provides a data retransmission device. According to the invention, through analyzing the packet-loss model matrix, the data packets to be retransmitted can be effectively combined, thereby reducing the retransmission times, and improving the retransmission efficiency.

The invention discloses a method for transmitting messages between network equipment, which comprises the following steps: a, establishing a retransmission array by taking a message identifier ID as an array index; b, when a request is generated, inserting the request into the retransmission array by taking the message identifier ID as the array index, and sending a message; c, sending a request message, simultaneously setting a retransmission timer for the sent message, if a response is not received when the timer is time out, taking opposite end ID + message ID as a return value, retrievinga unit that the opposite-end node ID takes the message ID as the array index, positioning to a retransmission array element for retransmitting the request message, accumulating transmission times, and deleting the message from a retransmission list if the transmission times exceed a designed maximum retransmission time threshold; and d, when the response is received, directly positioning to the retransmission array element according to the message ID, and deleting the corresponding request message. The method can greatly improve the efficiency of retransmitting the messages of the network equipment, acquires flexible balance between system resource occupation and the timeliness of message notification restoration, and ensures the accuracy of message transmission.

The invention discloses a network coding-based wireless cooperative broadcasting / multicasting method. In the method, a network coding data packet for retransmission is formed by combining and constructing data packets lost by a user in a network coding mode, and a cooperative user assists a user who fails to correctly receive all data packets at a first phase in receiving all data packets. The method is implemented by the following steps of: transmitting data packets by using a data source; selecting the cooperative user and specifying a request and performing network coding configuration; and transmitting network coding data packets in a cooperative way. A retransmission network coding data packet is constructed through network coding and user cooperation, so that retransmission times can be greatly reduced and system efficiency is improved.

In a transmission apparatus in a MIMO-OFDM communication system employing a cyclic diversity, a cyclic delay controller sets plural delay magnitudes different for respective antennas, in cyclic delayers for each predetermined timing. The cyclic delayers receive symbols subjected to orthogonal frequency division multiplexing, for the respective ones of plural allotted antennas. Besides, the cyclic delayers bestow cyclic delays on the individual symbols of the respective antennas in accordance with plural set delay magnitudes. The symbols cyclically delayed are outputted from the antennas. As the delay magnitudes, a first delay magnitude at a first transmission timing and a second delay magnitude at a second transmission timing are different for one antenna, and the delay magnitudes differ in the respective antennas for one transmission timing. Thus, in a MIMO-OFDM transmission scheme, a frequency diversity and a time diversity are enhanced to heighten a retransmission efficiency in a data retransmission mode.

The invention relates to an adaptive deceleration method of data transmission, which belongs to a data processing method of data transmission and solves the problems that wrong data which are previously transmitted cannot be utilized and additional operation is needed in the existing data transmission. The adaptive deceleration method comprises the following steps of subpackage, encoding and data transmission, wherein the data transmission comprises the following steps that a plurality of data packages are decoded and verified one by one by a receiving terminal; if the data packages are verified to be correct, a new data package is transmitted by a sending terminal; otherwise, data are retransmitted by the sending terminal, and joint decoding of a previous frame is performed by the receiving terminal; and the steps are continuously repeated until the data packages are decoded to be correct. According to the adaptive deceleration method, transmission data are divided into a plurality of data packages, so that errors are localized, and the retransmission efficiency is increased; by utilizing the encoding technique, a plurality of blocks of encoding data are generated from the same section of data, thereby realizing joint encoding on the receiving terminal, and the utilization ratio of the wrong data is increased; and additionally, the adaptive change of the wave velocity is realized in accordance with the channel quality, thereby removing redundant information and additional operation from transmission, and the transmission efficiency is further increased.

The invention discloses a communication method based on a polarization code. The communication method comprises the following steps: firstly, constructing an initial polarization code according to thenumber K of information bits, the number J of CRC bits and the encoding length N, wherein the initial polarization code comprises N coded bits, the positions of the information bits and the positionsof the CRC bits in the N coded bits are determined, and K + J is smaller than or equal to N; determining the importance of each coded bit according to the contribution of each coded bit; according tothe importance degree of each coded bit, punching partial coded bits with relatively low importance in the initial polarization codes to obtain a new punched polarization code, and the length of thecoded bits included in the new punched polarization codes is between K + J and N, and sending the new punched polarization code; or according to the importance degree of each coded bit, sending each coded bit according to the order of importance from high to low. According to the communication method based on the polarization code disclosed by the invention, the communication time of two parties can be reduced by combining the importance of the coded bits and hybrid retransmission, so that the retransmission efficiency can be improved.

The invention relates to the technical field of transmission of communication systems, in particular to a device and a method for improving retransmission efficiency of a communication system. An exclusive or coder is embedded into a transmitting end of a communication link and used for performing bit-by-bit exclusive or coding on a plurality of bit sequences retransmitted by the transmitting endand transmitting a combined data packet obtained after the exclusive or coding to a receiving end; and a multi-data packet detector is embedded into the receiving end of the communication link and used for detecting each retransmitted bit sequence from the combined data packet received by the receiving end. The exclusive or coder can merge and transmit the plurality of bit sequences retransmittedto the receiving end by the transmitting end, and the receiving end reduces each retransmitted bit sequence from the combined data packet by using the multi-data packet detector so as to save resources retransmitted from the transmitting end to the receiving end and further improve the retransmission efficiency of the communication system.

The invention provides a node communication method of an Ad hoc network. The method comprises: a wireless frame used by inter-node communication comprises a control domain, a data domain, and a feedback domain; a node transmits and receives wireless control information in the control domain, wherein the wireless control information comprises frame structure configuration information used for indicating the time domain structure or the frequency domain structure of the wireless frame or a combination of the time domain structure and the frequency domain structure; the node transmits and receives data via the data domain; and the node receives and transmits feedback information in the feedback domain, wherein the feedback information is constructed by the node according to the state of the data received in the data domain and comprises retransmission feedback indication, a channel quality index, or a combination thereof. The method provided by the invention may greatly improve retransmission efficiency while saving wireless resources, improve data transmission reliability, and reduce interference on adjacent nodes.

The invention discloses a long-distance link variable rate selection retransmission method. The method comprises the following steps: (1) adjusting a frame structure; (20) sending the data by use of the sending rate uniquely corresponding to different MCS by a sending end in a fixed sending rate, counting received signal strength and frame delivery rate at a receiving end to obtain a relationship between the MAC layer frame delivery rate and the received signal strength under different MCS; (30) randomly sending a rate to send the data frame by the sending end when firstly sending the data; (40) feeding back a BA frame to the sending end by the receiving end according to the received frame; (50) judging whether needs to send the next frame, if needing to send the next frame, turning to step (60) of sending the data frame with a designated rate by the sending end, or ending the operation; and (60), sending the data frame by use of the rate corresponding to the MCS indication area number in the BA frame by the sending end, and turning to step (40). By use of the retransmission method disclosed by the invention, the transmission efficiency when the channel quality is poor can be effectively improved.