Entries |
Document | Title | Date |
20080215949 | SERVER AND CLIENT FOR DETERMINING ERROR RESTORATION ACCORDING TO IMAGE DATA TRANSMISSION, AND METHOD OF DETERMINING ERROR RESTORATION ACCORDING TO IMAGE DATA TRANSMISSION - Provided are a server and client for determining error restoration according to image data transmission, and a method thereof. The server includes a forward error correction (FEC) mode performer to output image data in which a redundant bit for error correction is added, an automatic repeat request (ARQ) mode performer to outputs the image data after receiving a response signal according to a data reception from a client that receives the image data, a mode determiner to determine whether to operate in an FEC mode or an ARQ mode so that error restoration is performed on the image data according to a reception buffering capacity of the client in regard to image data, and an interface to transmit image data outputted from the FEC mode performer or the ARQ mode performer to the client. | 09-04-2008 |
20080229168 | Multi-Antenna Transmitting Apparatus, Multi-Antenna Receiving Apparatus, and Data Re-Transmitting Method - In a multi-antenna communication system using LDPC codes, a simple method is used to effectively improve the received quality by performing a retransmittal of less data without restricting applicable LDPC codes. In a case of a non-retransmittal, a multi-antenna transmitting apparatus ( | 09-18-2008 |
20080282127 | HYBRID AUTOMATIC REPEAT REQUEST SYSTEM AND METHOD - A data communication method for puncturing of parity bits defining all parity data for a minimum code rate generated by an encoder is disclosed. The method initializes an accumulator associated with the parity bits to an initial value, and for each parity bit increments the accumulator by a increment value and determines if the accumulator has overflowed. If the accumulator overflows, at least one of the parity bits is selected for transmission. | 11-13-2008 |
20080320357 | METHOD AND APPARATUS FOR REDUCING SIGNALING OVERHEAD IN A COMMUNICATION SYSTEM USING HYBRID AUTOMATIC REPEAT REQUEST - A transmitting unit combines a slot identifier (SI) and a block identifier (BI) in each header that is transmitted with the data to allow a receiving unit to associate previously received data blocks with retransmissions, or retries, of the same respective data blocks in order to perform bit error detection in accordance with a hybrid or selective ARQ protocol. The receiving unit uses the SI and BI contained in the MHBKs to determine a correspondence between a retried data and a previously transmitted data block. | 12-25-2008 |
20090024896 | Method and Apparatus for Improving Hybrid Automatic Repeat Request Operation in a Wireless Communications System - A method of improving Hybrid Automatic Repeat Request operation for a user equipment operating in HS-SCCH less operation in a wireless communications system includes receiving a retransmission data in an HARQ procedure, determining a decoding result of data stored in a first soft buffer, combining the retransmission data with the data stored in the first soft buffer for generating a combined data when the UE determines that the data stored in the first soft buffer has not been successfully decoded, and performing a decoding process on the combined data and a store process corresponding to a second soft buffer. The first soft buffer is obtained by a first rule and the second soft buffer is obtained by a second rule. | 01-22-2009 |
20090031185 | HYBRID ARQ SYSTEMS AND METHODS FOR PACKET-BASED NETWORKS - Systems and methods for hybrid automatic repeat-request (HARQ) communication, comprising a transmitter employing hybrid automatic repeat-request (HARQ) and able to retransmit an incorrectly received packet without differently re-encoding data bits. The transmitter is further able to select at least one bit from any in a set to forward in at least one retransmission. The set contains any bits punctured from an original transmission corresponding to the retransmission. Other embodiments transmit, by a transmitter using hybrid automatic repeat-request (HARQ), a packet containing at least one punctured bit, select—without differently re-encoding data bits—at least one bit from any in a set to forward in at least one re-transmission of an incorrectly received packet, and retransmit the packet with at least one different punctured bit. The set contains any bits punctured from an original transmission corresponding to the re-transmission. | 01-29-2009 |
20090150740 | TRANSMITTING APPARATUS AND TRANSMITTING METHOD - A transmitting apparatus and a transmitting method wherein the systematic bit reception quality can be improved and the throughput performance can be improved. An IR parameter control part ( | 06-11-2009 |
20090150741 | Modulation Symbol to Outer Codeword Mapping - The subject matter disclosed herein provides an outer coding framework that, in some implementations, provides frequency diversity to outer codewords that are mapped to modulation symbols. In one aspect, there is provided a method. The method may include inserting a received packet into a frame. Moreover, an outer code may be used to encode the frame. Furthermore, the values read from a column of the frame may be inserted into a link-layer packet. In addition, the column may be shuffled by moving the values of the column based on an offset. The link-layer packet may also be provided to enable an inner code to encode the link-layer packet before transmission. | 06-11-2009 |
20090150742 | Packet Error Rate Correlation Minimization - The subject matter disclosed herein provides an outer coding framework for reducing the correlation between packet errors in a wireless network. In one aspect, there is provided a method. The method may include receiving a packet including information. The received packet may be encoded using a forward error correction code to provide at least one, but no more than two, codewords. At least a portion of each codeword may be inserted into a transport packet for transmission to a client station, wherein the transport packet comprises information from at least one, but no more than two, of the codewords. The transport packet may be sent. Related systems, apparatus, methods, and/or articles are also described. | 06-11-2009 |
20090150743 | METHOD AND SYSTEM FOR CONSTRUCTING AND DECODING RATELESS CODES WITH PARTIAL INFORMATION - A method for data transmission to a receiving host, the transmitted data being coded for forward error correction, includes providing a pre-defined set X | 06-11-2009 |
20090177938 | Cognitive and Universal Impulse Noise Protection - Impulse noise from nearby or intense electrical sources can disrupt communications over digital subscriber lines. There are many methods to deal with errors produced by impulse noise sources. Forward error correction (FEC) codes such as Reed Solomon coding along with scrambling and interleaving are used to correct small errors. However, for larger errors, retransmission is favored. Retransmission can be applied at the Discrete Multi-tone symbol level thus eliminating the need to insert sequence identification into data transmission units, furthermore retransmission can also be employed to exploit the error correcting capabilities of the FEC codes. Finally, an impulse noise protection system can exploit impulse noise statistics to configure the redundancy in the FEC codes and to enable the use of blanking. Exemplary embodiments of systems described can cooperatively use impulse noise statistics to utilize retransmission, FEC and blanking to mitigate the effects of impulse noise. | 07-09-2009 |
20090193311 | RETRANSMISSION OF ERRONEOUS DATA - A method for retransmission of erroneous data in a communications system includes receiving data blocks at a receiver that have been generated in a transmitter by the use of an error correcting code. The received data blocks are decoded by a linear programming algorithm. One or more symbols in the decoded data block are identified by subjecting the symbols in the decoded data block to an integrality criterion. A retransmission of a part of the data block based on the one or more identified symbols is then initiated. | 07-30-2009 |
20090276678 | DATA TRANSMISSION SYSTEM, PROGRAM AND METHOD - A data transmission system includes a packet missing state data storage unit that stores packet missing state data including distribution of the numbers of consecutive missed packets in a decoder and distribution of intervals of the packet missing in the decoder; an interleave unit determination processing unit that determines, based on the distribution of the numbers of consecutive missed packets, an interleave unit that represents the number of Forward Error Correction (FEC) blocks, wherein the FEC block is a unit for which an FEC packet is generated; an FEC block determination processing unit that determines, based on the distribution of the intervals of the packet missing, the number of data packets included in the FEC block; and a packet communication processing unit that identifies, based on the determined interleave pattern data, a transmission order of the packets to the decoder. | 11-05-2009 |
20090276679 | Hybrid ARQ Transmission Method With Channel State Information - A method for decoding of multiple wireless signals by a chase combining hybrid-automatic-repeat-request CC-HARQ receiver includes demodulating wireless signals received from respective mobile sources using an effective channel matrix and decision statistics; updating log-likelihood-ratios LLRs and decoding the received codewords using the corresponding updated LLRs; determining set of correctly decoded codewords using a cyclic redundancy check; updating the effective channel matrix and decision statistics responsive to the step of determining; and resetting the effective channel matrix and decision statistics in the event that the number of decoding errors for a codeword exceeds its maximum limit after storing the updated LLRs of all remaining erroneously decoded codewords for which the number of decoding errors is below the respective maximum limit. | 11-05-2009 |
20090282311 | SYMBOL VECTOR-LEVEL COMBINING RECEIVER FOR INCREMENTAL REDUNDANCY HARQ WITH MIMO - Techniques are provided for transmitting and receiving a mother code in an incremental redundancy hybrid automatic repeat-request protocol. A set of information bits corresponding to a message may be encoded and interleaved to produce the mother code. Each bit position of the mother code may be mapped to an output symbol, and each output symbol may be mapped to an antenna for transmission. One or more transmissions of symbols contained in the output symbols may be performed, where each transmission may include puncturing the mother code by selecting one or more symbols from the of output symbols, and transmitting each symbol in the one or more symbols on an antenna corresponding to that symbol. The mother code may be decoded, in part, by determining combinable bits contained within a set of received symbols, and computing one or more log-likelihood ratio values corresponding to each symbol in the set of received symbols. | 11-12-2009 |
20090282312 | METHOD, SYSTEM AND DEVICE FOR RETRANSMITTING DATA - A method, system, and device for retransmitting data are provided. The method includes the following steps. In Step A, a receiving device detects a received frame that bears data, determines that the data frame is damaged, and judges whether the number of the damaged frames meets a set retransmission threshold value in a set range or not. If yes, Step B is performed. Otherwise, Step C is performed. In Step B, the receiving device sends a retransmission request to a sending device, the sending device retransmits the frame, and the process turns to Step A. In Step C, the receiving device performs a decoding processing on the data borne in the damaged frame that is received. | 11-12-2009 |
20090300459 | DATA TRANSMISSION APPARATUS AND DATA RECEPTION APPARATUS - A transmission apparatus receives information used to identify data unsuccessfully received by a reception apparatus. Then, the transmission apparatus determines whether the data corresponding to the received identification information should be retransmitted based on whether the reception apparatus has a function of displaying the display area of the data corresponding to the identification information by using data having the display area corresponding to the data corresponding to the identification information. | 12-03-2009 |
20090313519 | REDUCING HARQ RETRANSMISSIONS USING PEAK POWER MANAGEMENT TECHNIQUES - Systems, methods and apparatuses for reducing HARQ retransmissions using peak power management techniques are presented. In one example, a receiver may perform multi-level error correction for reducing HARQ retransmissions. The receiver may include a Peak to Average Power Ratio Management Module (PAPR MM) decoder configured to perform a first level of error correction utilizing retransmissions originating at a front end of a distal transmitter. The receiver may further include a symbol demapping module connected to the PAPR MM decoder, a deinterleaver connected to the symbol demapping module, and a decoder connected to the deinterleaver and the PAPR MM decoder, where the decoder may be configured to perform a second level of error correction utilizing retransmissions originating at a back end of a distal transmitter. A transmitter for reducing HARQ retransmissions using PAPR techniques is also presented. | 12-17-2009 |
20090313520 | METHOD OF ENCODING/DECODING USING LOW DENSITY CHECK CODE MATRIX - A method of encoding data using a parity check matrix, a method of decoding encoded data, and a data retransmission method using the same are disclosed. A data retransmission method in a communication system includes transmitting a codeword encoded by a first parity check matrix corresponding to a first coding rate, among at least two parity check matrixes corresponding to different coding rates, receiving NACK from the receiver in response to the codeword, and transmitting parity bits encoded by some of the second parity check matrix corresponding to a second coding rate, among the at least two parity check matrixes, to the receiver. | 12-17-2009 |
20090319855 | Systems and Methods for Adaptive Hybrid Automatic Retransmission Requests - A turbo coded hybrid ARQ with both IR and repetition existing in one or more transmission blocks is designed. The mixed combining is performed at the receiver—Chase combining is performed for the repetitions first, followed by code combining for all code bits based on Chase combining outputs. The packet error probability is obtained by applying the union-Bhattacharyya (UB) bound for parallel channels. The throughput optimization of hybrid ARQ is determined as well as the optimal assignment rates by solving the optimization using a genetic algorithm. | 12-24-2009 |
20090327831 | Automatic Retransmission Controller And Retransmission Block Recombination Apparatus - This invention proposes an automatic retransmission controller and a retransmission block recombination apparatus, of which the automatic retransmission controller comprises a responsive reception unit that receives the information fed back from the receiver; a retransmission judging unit that determines coded data blocks to be retransmitted according to the information received by the responsive reception unit; and a data acquisition unit that acquires a part of data in each of the coded data blocks to be retransmitted judged by the retransmission judging unit for recombination to form a retransmission coded block, when the number of the coded data blocks to be transmitted is more than one. | 12-31-2009 |
20100005360 | IMPORTANCE-BASED FED-AWARE ERROR-REPAIR SCHEDULING - Particular embodiments generally relate to providing retransmission that is forward error correction (FEC) aware. In one embodiment, information is received that defines a plurality of missing packets for a media stream for a receiver. The plurality of missing packets may define FEC packets and source packets that are missing at the receiver. A retransmission server determines one or more retransmission packets for retransmission based on the FEC packets and source packets received at the receiver. In taking into account the FEC packets and source packets received at the receiver, retransmission of all missing source packets may not be necessary. The one or more retransmission packets are then sent to the receiver and the receiver can use the one or more retransmission packets to recover the plurality of missing source packets. The retransmission server may take into account the FEC and source packets received at multiple receivers and perform error repair such that a maximum total number of source packets can be repaired at all receivers. | 01-07-2010 |
20100005361 | RETRANSMISSION CONTROL METHOD AND COMMUNICATIONS DEVICE - A retransmission control method comprising: generating N parity check matrices; generating a generator matrix containing a check symbol generator matrix contained in the first parity check matrix; transmitting the codeword generated by using the generator matrix to another communications device; generating, when the communications device receives a NAK in response to the codeword, a first additional parity by using the second parity check matrix; and retransmitting the first additional parity to the another communications device. | 01-07-2010 |
20100017675 | SUPPORTING HYBRID AUTOMATIC RETRANSMISSION REQUEST IN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING ACCESS RADIO ACCESS SYSTEM - A method of supporting a hybrid automatic retransmission request (HARQ) in an orthogonal frequency division multiplexing access (OFDMA) radio access system is disclosed. Preferably, the method comprises receiving a downlink data frame comprising a data map information element and a data burst comprising a plurality of layers, wherein each layer is encoded with a corresponding channel encoder, and wherein the data map information element is configured to support multiple antennas to achieve space time transmit diversity by providing control information associated with each one of the plurality of layers, wherein the control information comprises allocation of acknowledgement status channels corresponding to the plurality of layers, and transmitting in an uplink data frame a plurality of acknowledgement status, each acknowledgement status being associated with whether a corresponding layer of the plurality of layers is properly decoded. | 01-21-2010 |
20100023834 | CODING SCHEMES FOR WIRELESS COMMUNICATION TRANSMISSIONS - Systems and methodologies are described that facilitate transmitting low-density parity-check encoded communications in a wireless communications network and incrementing such codes in response to requests from receiving devices. The LDPC codes can have associated constraints allowing the codes to be error corrected upon receipt. The requests for incremented codes can be in cases of low transmission power or high interference, for example, where the original code can be too error-ridden to properly decode. In this case, additional nodes can be added to current and/or subsequent communications to facilitate adding a more complex constraint to the LDPC code. In this regard, the large codes can require less validly transmitted nodes to predict error-ridden values as the additional constraint renders less ambiguity in possible node value choices. | 01-28-2010 |
20100023835 | Method and Apparatus for Improving HARQ Operation - The present invention provides a method for improving a Hybrid Automatic Repeat Request (HARQ) operation in a user equipment (UE) of a wireless communication system. The UE operates in an HS-SCCH Less Operation. The method includes steps of decoding data of an HARQ procedure corresponding to a current Transmission Time Interval (TTI); delivering the data to an upper layer reordering entity and reporting a positive acknowledgement (ACK) corresponding to the data when the data is successfully decoded; and considering data stored in a soft buffer corresponding to the current TTI has been decoded successfully. | 01-28-2010 |
20100023836 | OFDM Signal Collision Position Detection Apparatus and OFDM Reception Apparatus - A pilot reception power measuring section measures reception power of a pilot symbol and a data section reception power prediction section predicts reception power of data symbols based on the reception power of the pilot symbol. A power comparison section calculates a difference between this predicted value and the actual reception power of the data symbol, and when the difference is large, a collision position detection section regards the data symbol at the hopping position as colliding with data symbols in other cells. Then, an error correcting decoding section carries out error correcting processing by reducing likelihood of the data symbols detected to be involved in the collision and can thereby improve the error rate characteristic of decoded data. | 01-28-2010 |
20100031111 | Dynamic Overwriting of Physical Downlink Control Channel for Hybrid Automatic Repeat Request Associations for Downlink Semi-Persistent Scheduling - A method for assigning hybrid automatic repeat request (HARQ) process ID is provided. The method includes, when a retransmission associated with a first initial semi-persistent scheduling (SPS) transmission having a first HARQ process ID is expected to occur after a second initial transmission previously configured with SPS resource, explicitly assigning a second HARQ process ID to the second initial transmission wherein the second HARQ process ID is different from the first HARQ process ID. | 02-04-2010 |
20100088568 | Retransmissions in a Wireless Communications System | 04-08-2010 |
20100088569 | Packet Retransmission - Embodiments disclosed herein include systems and methods of packet retransmission. More specifically, at least one nonlimiting example of a method includes receiving data from above a γ (gamma) interface, the data being identified as protected or not protected data; and storing the protected fragment in a retransmission queue included in a transport protocol specific transmission convergence layer. | 04-08-2010 |
20100088570 | Apparatus and method for supporting hybrid automatic repeat request in wireless communication system - A wireless communication system includes an apparatus and a method for supporting Hybrid Automatic Repeat Request. A transmitting method includes when an encoding packet is bigger than a maximum encoding packet size Nep_max, generating a first codeword by encoding the encoding packet at a mother code rate t; generating a second codeword by selecting [Nep_max/t]-sized code bits from the first codeword; and performing Hybrid Automatic Repeat reQuest (HARQ) using the second codeword. | 04-08-2010 |
20100095184 | Obtaining Erasure-Coded Fragments Using Push and Pull Protocols - Obtaining erasure-coded fragments using push and pull protocols, including the steps of receiving a first set of erasure-coded fragments associated with segments via a transmission using push protocol, whereby the first set is not sufficient for reconstructing some of the segments; and retrieving a second set of erasure-coded fragments using a fragment pull protocol, wherein the first and the second sets together are sufficient for reconstructing the segments. | 04-15-2010 |
20100122137 | COMMUNICATION SYSTEM AND METHOD FOR TRANSMITTING OR RECEIVING PACKETS THEREIN - A communication system and a method for transmitting or receiving packets are provided. The method includes transmitting the packet from a transmitting Radio Link Control (RLC) entity to a receiving node via a transmitting Medium Access Control (MAC) entity, transmitting an Hybrid Automatic ReQuest (HARQ) failure signal from the transmitting MAC entity to the transmitting RLC entity if the transmitting MAC entity receives a HARQ Negative ACKnowledgment (NACK) signal from the receiving node, and re-transmitting the packet from the transmitting RLC entity to the receiving node via the transmitting MAC entity if the transmitting RLC entity receives the HARQ failure signal. | 05-13-2010 |
20100131818 | RETRANSMISSION METHOD AND DEVICE BASED ON LOW DENSITY PARITY CHECK CODES - A retransmission method based on Low Density Parity Check (LDPC) and devices thereof are provided in embodiment of this present invention, so as to increase the system throughput. In the present invention, when retransmission is needed, the partial bits in the information sequence to be retransmitted are replaced by the prior information that the transmitter and the receiver both have know, with the replaced information sequence is LDPC coded, LDPC check sequence is obtained and is sent to the receiver. After receiving the LDPC check sequence, the receiver decodes the information sequence including the prior information with the LDPC check sequence. If the decoding is successful, after removing the prior information from the decoded information sequence, the receiver refills the decoded bits in a previous received information sequence, and performs decoding again with an LDPC check sequence corresponding to the previous received information sequence and obtains a complete information sequence. | 05-27-2010 |
20100138716 | METHOD AND APPARATUS FOR CONTROLLING TRANSMITTING, RECEIVING, AND RE-TRANSMISSION - The present invention relates to a method and apparatus that are capable of executing the error correction decoding process while controlling the increase in the amount of data that is stored in the receiving apparatus. There is provided a transmitting apparatus for transmitting the data to a receiving apparatus to execute the error correction decoding process using, for example, the received data and the re-transmitted data, comprising a transmitting data generating means for generating a first transmitting data by executing the rate matching process to a first part of the error correction coded data and generating a second transmitting data including at least the data not included in the first part by executing the rate matching process on the basis of the error correction coded data, and a transmitting means for executing the transmission of the second transmitting data as the re-transmission after the transmission of the first transmitting data. | 06-03-2010 |
20100153809 | METHODS AND SYSTEMS USING WINDOW START UPDATE FOR WIRELESS COMMUNICATION HARQ CONNECTION - Embodiments of the present disclosure allow a HARQ transmitter to provide a receiver an indication of the protocol data units (PDUs) that should not be expected because they are part of a data burst that has been retransmitted a maximum allowable number of times. The indication message may contain a maximum serial number contained in the data burst that has reached the maximum number of retransmissions, or the serial number of a first PDU in the next data burst. | 06-17-2010 |
20100162070 | METHOD AND APPARATUS FOR OPTIMIZING A RETRY LIMIT FOR MULTIMEDIA SYSTEMS THAT ARE PRONE TO ERRORS - Devices, systems and methods for optimizing a number of retransmission attempts in a multimedia environment and managing delays in a host MAC layer. In its various aspects, the presently claimed invention includes several methodologies and systems that are configured for determining an optimal retry limit in response to one or both of a packet error rate bound and a latency bound. To the extent that the retry limit is determined with respect to one of the aforementioned boundaries, the presently claimed invention may include determining a confidence level that the non-selected bound will also be met by the selected retry limit. The presently claimed invention details devices, systems and methods optimizing the number of retransmission attempts to ensure delivery of the selected data packets while guarding against undue delays and application disruptions. | 06-24-2010 |
20100180173 | Hybrid-ARQ (HARQ) with Scrambler and Diversity - Embodiments of the invention provide a system and method of hybrid automatic repeat-request (HARQ) processing. A viterbi decoder is coupled to and follows a descrambler. After the signal has been de-scrambled, it can be stored in a memory in case it needs to be recombined with another packet. This means that the log-likelihood ratios LLRs for each transmitted bit are stored in memory using a finite number of bits (for example, between 4 and 12 bits). If the packet that is currently being processed contains retransmitted information, then the de-scrambled output stored from a previous packet containing the same information can be loaded and combined with the current packet. | 07-15-2010 |
20100185911 | METHODS AND SYSTEMS USING THRESHOLD SWITCHES FOR PROTOCOL ACCELERATORS - Certain embodiments of the present disclosure control whether or not certain protocol stack operation are performed in a hardware (HW) protocol stack accelerator based on ARQ/HARQ re-transmission rate. Latency penalties associated with using the HW accelerator are typically higher than the data movement overhead when this data does not need to be processed by the HW accelerator, such as when a re-transmission error occurs. According to certain embodiments, the HW accelerator is activated if the ARQ/HARQ re-transmission rate is below a threshold value. Otherwise, if the ARQ/HARQ re-transmission rate is above a threshold, at least a portion of the HW accelerator may be de-activated, which may reduce overhead associated with moving data between the protocol stack and the HW accelerator. | 07-22-2010 |
20100223524 | Forward Error Correction Decoding Avoidance Based on Predicted Code Block Reliability - A method and device for performing forward error (FEC) correction avoidance based upon predicted block code reliability in a communications device is provided. An avoidance unit comprising a metric computation unit and a decision unit generates a reliability metric based upon a received code block. The reliability metric is compared to a reliability threshold, and the forward error correction decoder in the communications device is disabled if the metric is below or equal to the threshold. | 09-02-2010 |
20100251058 | METHOD AND APPARATUS FOR RETRANSMISSION MANAGEMENT FOR RELIABLE HYBRID ARQ PROCESS - A method for transmitting a packet from a transmitter to a receiver in a wireless communication system begins by building a packet by a transport format combination (TFC) selection process, and the packet is transmitted from the transmitter to the receiver. If the transmitter receives an indication that the packet was not successfully received at the receiver, the packet is retransmitted via a hybrid automatic repeat request (HARQ) procedure. If the HARQ procedure did not successfully transmit the packet, then the packet is retransmitted via a retransmission management (RM) procedure. If the RM procedure did not successfully transmit the packet, then the packet is discarded by the transmitter. | 09-30-2010 |
20100262886 | SELECTIVE DECODING OF RE-TRANSMITTED DATA BLOCKS - In at least some embodiments, a method includes receiving a transport block transmission having a plurality of code words and decoding the code words. The method also includes testing each decoded code word to identify each code word as a good code word or a bad code word. During a subsequent retransmission of the transport block, the method includes repeating the decoding and the testing for previously identified bad code words, but not for previously identified good code words. | 10-14-2010 |
20100281327 | COMMUNICATION SYSTEM, TRANSMITTER, ERROR CORRECTING CODE RETRANSMITTING METHOD, AND COMMUNICATION PROGRAM - Intended is to achieve, in a wide range of an SN ratio, throughput on the same order of that attained by a method based on puncturing and improve computational complexity of decoding processing at a high coding rate. In a communication system for transmitting an error correcting code for an error on a communication path from a transmitter to a receiver, the transmitter divides information bits of a code word to be transmitted into a plurality of blocks based on a request for retransmission of an error correcting code from the receiver, generates an error correcting code by compact-coding of one block among the plurality of blocks and transmits the generated error correcting code. | 11-04-2010 |
20100313096 | ERROR CONTROL IN MULTICAST VIDEO DISTRIBUTION - An embodiment of the invention includes an efficient error-control system and method for recovering packet losses, especially losses in distributing multicast video over broadband residential networks. Preferably, unlike most existing error-control algorithms designed for Internet multicast, the system and method does not employ substantial feedback suppression. Preferably, the system and method does not employ substantial multicasted retransmission. Preferably, the system and method does not employ substantial parity retransmission. Preferably, the system and method does not employ substantial local loss recovery. The system and method integrates two existing classes of error-control algorithms: Automatic Repeat Request (ARQ) and Forward Error Correction (FEC), to reduce traffic overhead and achieve scalability. | 12-09-2010 |
20110066912 | METHOD AND SYSTEM TO INCREASE THE THROUGHPUT OF A HYBRID AUTOMATIC REPEAT REQUEST (HARQ) PROTOCOL - A method and system to increase the throughput of a HARQ protocol in a wireless network. When a station receives a downlink HARQ sub-burst that has an incorrect cyclic redundancy check, it determines if there is an overflow event of its buffer. If so, the station reduces the size of the HARQ sub-burst to be stored in the buffer and stores the resized HARQ sub-burst in the buffer. When the station transmits an uplink HARQ sub-burst, the station can reduce the size of the transmitted HARQ sub-burst if it exceeds the size of the buffer. The amount of buffer required in the station can also be reduced by representing each log likelihood ratio (LLR) value of each of one or more bits of each symbol of a HARQ burst with a number of quantization bits based on a metric sensitivity to noise of each bit of each symbol. | 03-17-2011 |
20110078531 | RADIO COMMUNICATION APPARATUS, RADIO COMMUNICATION SYSTEM, AND RADIO COMMUNICATION METHOD IN RADIO COMMUNICATION SYSTEM - A radio communication apparatus for performing radio communicate with other radio communication apparatus, the radio communication apparatus including: a quality measuring unit which measures reception quality of reception signal which is received from the other radio communication apparatus; a first error detecting unit which detects an error of reception data included in the reception signal on the basis of the reception quality and a first threshold value; and a retransmission request signal generating unit which generates a retransmission request signal on the basis of an error detection result of the first error detection unit, and transmits the retransmission request signal to the other radio communication apparatus. | 03-31-2011 |
20110093758 | Multi-Hop Network Having Increased Reliability - The present disclosure is directed to networks having increased reliability and associated methods. In one aspect, a method for increasing reliability of a multi-hop network can include generating an erasure correction packet from a data packet using an encoder system, and splitting the erasure correction packet into a plurality of erasure correction subpackets. The erasure correction subpackets can then be transmitted across a plurality of network paths of a multi-node network using a communication system. The method can also include identifying successfully received erasure correction subpackets, and regenerating the data packet from the successfully received erasure correction subpackets using a data aggregation system and a decoder system. | 04-21-2011 |
20110107171 | RECEPTION METHOD AND RECEPTION DEVICE - In a multicarrier wireless communication system adopting forward error correction codes, a reception method adapted to a receiver | 05-05-2011 |
20110119551 | Memory System with Error Detection and Retry Modes of Operation - A memory system includes a link having at least one signal line and a controller. The controller includes at least one transmitter coupled to the link to transmit first data, and a first error protection generator coupled to the transmitter. The first error protection generator dynamically adds an error detection code to at least a portion of the first data. At least one receiver is coupled to the link to receive second data. A first error detection logic determines if the second data received by the controller contains at least one error and, if an error is detected, asserts a first error condition. The system includes a memory device having at least one memory device transmitter coupled to the link to transmit the second data. A second error protection generator coupled to the memory device transmitter dynamically adds an error detection code to at least a portion of the second data. | 05-19-2011 |
20110119552 | METHOD AND APPARATUS FOR CONTROLLING ITERATIVE DECODING IN A TURBO DECODER - 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. | 05-19-2011 |
20110126072 | COMMUNICATION DEVICE, COMMUNICATION SYSTEM, RECEPTION METHOD AND COMMUNICATION METHOD - A communication device includes: a reception unit which receives a signal including an initial transmission signal and a retransmission signal for any one signal; a detection order determination unit which determines an order of detection of the initial transmission signal and the retransmission signal from the signal received by the reception unit, according to retransmission repetition numbers of the initial transmission signal and the retransmission signal; and a signal detection unit which detects signals including detected signals for the initial transmission signal and the retransmission signal from the signal received by the reception unit using signals detected by the communication device according to the order determined by the detection order determination unit. The signal detection unit includes a combining unit which combines the detected retransmission signal and a signal detected from a previously received signal including at least one related signal received earlier than the retransmission signal. | 05-26-2011 |
20110138247 | Frequency-diversity 8-VSB am broadcasting to mobile/handheld receivers - A system for broadcasting the same data in concatenated convolutional coded (CCC) form from a network of 8-VSB amplitude-modulation transmitters operated with different radio-frequency carrier waves assigns the coded data to time-interleaved ones of time slots that are universal throughout the network. Therefore, a mobile/handheld (M/H) receiver with a single frequency-agile tuner can provide frequency-diversity reception of the time-interleaved data in CCC form. Alternatively, an M/H receiver with two tuners is used to provide frequency-diversity reception of the time-interleaved data in CCC form. The system for a network of 8-VSB AM transmitters that broadcast the same data in CCC form can further provide for each 8-VSB AM transmitter to make repeated transmissions of data in CCC form, to facilitate iterative-diversity reception of those transmissions by M/H receivers. | 06-09-2011 |
20110161769 | RETRY BASED PROTOCOL WITH SOURCE/RECEIVER FIFO RECOVERY AND ANTI-STARVATION MECHANISM TO SUPPORT DYNAMIC PIPELINE LENGTHENING FOR ECC ERROR CORRECTION - Methods and apparatus relating to retry based protocol with source/receiver FIFO (First-In, First-Out) buffer recovery and anti-starvation mechanism to support dynamic pipeline lengthening for ECC error correction are described. In an embodiment, upon detection of an error, a portion of transmitted data is stored in one or more storage devices before retransmission. Other embodiments are also described and claimed. | 06-30-2011 |
20110179332 | Method For Automatic Repeat Request Operation, Transceiver Arrangement, And Computer Program - A method for automatic repeat request operation of a plurality of simultaneous automatic repeat request processes is disclosed. The method comprises receiving a transmission comprising at least one transport block; storing soft bits of the transport block in a buffer; and transmitting an automatic repeat request process signal, wherein the transmitting of the automatic repeat request process signal comprises one of: transmitting an acknowledgment signal if the transport block is determined to be properly received, transmitting a negative acknowledgement signal if the transport block is determined to contain an error, and transmitting a blocking indication signal if there is not room enough for the soft bits in the buffer. A transceiver arrangement and a computer program are also disclosed. | 07-21-2011 |
20110197103 | DECODING METHOD AND APPARATUS OF RETRANSMISSION COMMUNICATION SYSTEM - A decoding method and apparatus of a retransmission communication system are provided. In the decoding method and apparatus, weights are applied to error data and retransmitted data, and the resulting error data and the resulting retransmitted data are chase-combined. Therefore, it is possible to reduce the coding rate of combined data and enhance the reliability of decoding. | 08-11-2011 |
20110231727 | PACKET TRANSMISSION APPARATUS, COMMUNICATION SYSTEM AND PROGRAM - A packet transmission apparatus is provided. The packet transmission apparatus transmits a packet having a limited arrival deadline through a best-effort network. The packet transmission apparatus includes an automatic packet retransmission section to control retransmission of an undelivered packet, a forward error correction coding section to add a redundant packet to a data packet block, and a redundancy determining section to dynamically determine redundancy of the redundant packet based on observed network state information, so that a loss rate after error correction at a receiver achieved by only the retransmission of the undelivered packet satisfies an allowable loss rate after error correction. | 09-22-2011 |
20110239075 | CHANNEL CODING, MODULATING AND MAPPING METHOD FOR HYBRID AUTOMATIC REPEAT REQUEST OF LOW DENSITY PARITY CHECK CODE - The present invention discloses a method for channel coding and modulation mapping in HARQ of the LDPC code, comprising: performing structural LDPC encoding of an information bit sequence with a length of K input by a channel encoder, and sending a generated codeword to a HARQ buffer; rearranging codeword bits of a LDPC HARQ mother code in the HARQ buffer, and sequentially selecting codeword bits to generate a binary sequence of a HARQ packet; mapping codeword bits of the HARQ packet to a constellation, and high-order bits in encoding blocks of the HARQ packet being mapped to high reliability bits in the constellation. The present invention provides the LDPC codeword with the maximal constellation gain, so that the LDPC HARQ channel encoding has the optimal performance. | 09-29-2011 |
20110239076 | System and Method for Transmitting and Receiving Acknowledgement Information - A system and method for transmitting and receiving acknowledgement information are provided. A method for communications device operations includes determining a hybrid automatic repeat request (HARQ) response for each CC in a set of configured CCs, thereby producing a set of HARQ responses, generating an information vector from the set of HARQ responses, encoding the information vector, and transmitting the encoded information vector. A sub-vector of one or more bits selected from the information vector is assigned a fixed vector value independent of HARQ responses for CCs not in a set of CCs when the set of CCs is not empty, where the set of CCs comprises at least one CC whose HARQ response is equal to DTX. | 09-29-2011 |
20110246848 | LT DECODING AND RETRANSMISSION FOR WIRELESS BROADCAST - Methods and systems for doped rateless retransmission include receiving ratelessly coded symbols. An attempt is made to decode the coded symbols using a processor by creating an associated code graph that represents the structure of the rateless code used by the symbols. If the decoding attempt fails, an input node is selected from the code graph using a metric that gauges the number and degree of connections to the input node based on the code graph structure. The selected input node is then requested for retransmission of the selected input node by a feedback channel. | 10-06-2011 |
20110264978 | Cognitive and Universal Impulse Noise Protection - Impulse noise from nearby or intense electrical sources can disrupt communications over digital subscriber lines. There are many methods to deal with errors produced by impulse noise sources. Forward error correction (FEC) codes such as Reed Solomon coding along with scrambling and interleaving are used to correct small errors. However, for larger errors, retransmission is favored. Retransmission can be applied at the Discrete Multi-tone symbol level thus eliminating the need to insert sequence identification into data transmission units, furthermore retransmission can also be employed to exploit the error correcting capabilities of the FEC codes. Finally, an impulse noise protection system can exploit impulse noise statistics to configure the redundancy in the FEC codes and to enable the use of blanking. Exemplary embodiments of systems described can cooperatively use impulse noise statistics to utilize retransmission, FEC and blanking to mitigate the effects of impulse noise. | 10-27-2011 |
20110271162 | TRANSMITTER DEVICE, COMMUNICATION SYSTEM, AND COMMUNICATION METHOD - In a communication system, a transmitter device transmits data to a receiver device for performing error-correcting decoding processing by combining received data and retransmitted data. The transmitter device selects one of a first set of schemes of an M number of modulation and coding schemes as a modulation and coding scheme (MCS) of first data according to communication quality information obtained from the receiver device when the first data is initially transmitted, and selects one of a second set of schemes of an N number of MCSs (N11-03-2011 | |
20110314351 | DATA TRANSFER DEVICE, METHOD, AND PROGRAM - A data transfer device, including a packet receiving unit to receive packets in a block including a data packet and an error-correction packet; a packet-loss detection unit to detect a packet loss from a head of a block received by the packet receiving unit of a received packet; a packet transfer unit to transfer the packet received from the packet receiving unit with a delay of a predetermined time; and a retransmission-request transmission unit to transmit a retransmission request to a packet-transmission source device based on the packet loss detected by the packet-loss detection unit and a determined retransmission time to retransmit the packet. | 12-22-2011 |
20120030535 | Distributed Block Coding (DBC) - Various embodiments implement distributed block coding (DBC). DBC can be used for, among other things, distributed forward error correction (DFEC) of source data in communication systems or parity backup for error correction of source data in storage systems where the source data may be corrupted by burst errors. A distributed block encoder (DBE) encodes sequential source data symbols with a plurality of sequential block encoders to produce interleaved parity codewords. The interleaved parity codewords enable decoding of error-corrected source data symbols with a distributed block decoder (DBD) that utilizes a plurality of sequential block decoders to produce the error-corrected source data symbols. A distributed register block encoder (DRBE) and a distributed register block decoder (DRBD) can each be implemented in a single block encoder and a single block decoder, respectively, by using a distributed register arrangement. | 02-02-2012 |
20120066562 | INCREASING HYBRID AUTOMATIC REPEAT REQUEST (HARQ) THROUGHPUT - In some embodiments, the invention involves increasing hybrid automatic repeat request (HARQ) throughput. In one embodiment, throughput may be increased by clearing the retransmission buffer at least one frame in advance, based on status received from the downlink device before a full acknowledgement. Another embodiment partitions HARQ bursts into two groups. A first group is for packet data units (PDUs) that are anticipated to be in error and a second group is for PDUs anticipated to be received correctly. Only PDUs that are anticipated to be in error, based on forward error correction (FEC) blocks, are to be saved in the retransmission buffer. Other embodiments are described and claimed. | 03-15-2012 |
20120072800 | TECHNIQUES FOR SUCCESSIVE REFINEMENT OF METRICS STORED FOR HARQ COMBINING - An embodiment of the present invention provides a method of efficiently storing metrics for Hybrid Automatic Retransmission Request (HARQ) combining and enabling saving of memory buffer in communication systems, comprising using non-linear quantization of the metrics and managing an aggregated buffer for all HARQ channels. | 03-22-2012 |
20120079339 | METHOD, DEVICE AND COMMUNICATION SYSTEM FOR RETRANSMISSION BASED ON FORWARD ERROR CORRECTION - Embodiments of the present invention provide a method for retransmission based on forward error correction. The method includes: when received source data packets loss occurs, judging whether all of the lost source data payloads can be decoded by using the received source data payloads and check data; if all of the lost source data payloads cannot be decoded, determining needed source data symbols for decoding all of the lost source data payloads by using the received source data payloads and the check data; and requesting for retransmitting the needed source data symbols. | 03-29-2012 |
20120110406 | RATE MATCHING METHOD AND DEVICE - The present invention discloses a rate matching method and device. The method includes that: an information bit sequence is coded and interleaved to obtain a mother code codeword with a length N | 05-03-2012 |
20120131407 | LAYER-AWARE FORWARD ERROR CORRECTION ENCODING AND DECODING METHOD, ENCODING APPARATUS, DECODING APPARATUS, AND SYSTEM THEREOF - A layer-aware Forward Error Correction (FEC) encoding and decoding method for encoding and decoding an information content, an encoding apparatus, a decoding apparatus, and a system thereof are provided, wherein the information content has a plurality of layer source symbol sets. In the encoding method, source symbols of each layer are encoded into encoding symbols corresponding to the layer by using an FEC encoder. In addition, final encoding symbols of an upper layer are generated by aggregating encoding symbols of both the upper layer and a lower layer. Thereby, the layer-aware FEC encoding method can maintain the encoding/decoding dependency between different layers of data without increasing the complexity of the encoding/decoding operations. | 05-24-2012 |
20120144259 | REED-SOLOMON ERASURE DECODING WITH ERROR DETECTION FOR RETRANSMISSION - By utilizing Reed-Solomon erasure decoding algorithms and techniques, the system is able to perform error detection for the case where the number of bytes received in error exceeds a correcting capability of a decoder. The error detection can be used, for example, to determine whether a codeword is decodable, and whether the retransmission of data is necessary. The retransmission can be accomplished by assembling a message that is sent to another modem requesting retransmission of one or more portions of data, such as one or more codewords. | 06-07-2012 |
20120159278 | Method of Handling a Damage Information-Assisted Hybrid ARQ Scheme and Related Communication Device - A method of handling a retransmission of a hybrid automatic repeat request scheme for a receiver in a communication system is disclosed. The method comprises receiving a first payload from a transmitter in the communication system, and feeding back a resource index to the transmitter, to indicate a size for a second payload in the next reception, when the receiver is unsuccessful to decode the first payload into a plurality of information bits, wherein the transmitter encodes the plurality of information bits into the first payload by using an error correction code. | 06-21-2012 |
20120159279 | DATA THROUGHPUT FOR CELL-EDGE USERS IN A LTE NETWORK USING DOWN-LINK REPEATERS AND UP-LINK HARQ RELAYS - A combination of repeaters and relays is used to improve the data throughput for user equipment (“UE”) near the cell edge in a LTE network. Amplify-and-forward repeaters and decode-and-forward relays enhance the down-link and up-link, respectively. Relay assistance on the up-link occurs when the evolved Node B (“eNB”) requests a retransmission (HARQ) from the UE at which point the UE and relay transmit simultaneously in a cooperative fashion. The quality of the up-link signal received by the eNB is improved due to a favorable channel through the relay. An analysis shows that relay assistance improves the throughput for a cell-edge user when the average delay per data transport block is allowed to increase. | 06-21-2012 |
20120173946 | METHOD AND SYSTEM FOR SUPPORTING MULTIPLE HYBRID AUTOMATIC REPEAT REQUEST PROCESSES PER TRANSMISSION TIME INTERVAL - A method and apparatus may be used for supporting multiple hybrid automatic repeat request (H-ARQ) processes per transmission time interval (TTI). A transmitter and a receiver may include a plurality of H-ARQ processes. Each H-ARQ process may transmit and receive one TB per TTI. The transmitter may generate a plurality of TBs and assign each TB to a H-ARQ process. The transmitter may send control information for each TB, which may include H-ARQ information associated TBs with the TBs. The transmitter may send the TBs using the associated H-ARQ processes simultaneously per TTI. After receiving the TBs, the receiver may send feedback for each of the H-ARQ processes and associated TBs indicating successful or unsuccessful receipt of each of the TBs to the transmitter. The feedback for multiple TBs may be combined for the simultaneously transmitted H-ARQ processes, (i.e., TBs). | 07-05-2012 |
20120185743 | METHOD AND APPARATUS FOR DATA SECURITY AND AUTOMATIC REPEAT REQUEST IMPLEMENTATION IN A WIRELESS COMMUNICATION SYSTEM - A method and apparatus for implementing data security and automatic repeat request (ARQ) in a wireless communication system are disclosed. Cipher entities are included in a wireless transmit/receive unit (WTRU) and an access gateway (aGW), and outer ARQ, (or radio link control (RLC)), entities are included in the WTRU and an evolved Node-B (eNode-B). Each cipher entity is located on top of an outer ARQ entity. The cipher entities cipher and decipher a data block by using a generic sequence number (SN) assigned to the data block. The outer ARQ entities may segment the ciphered data block to multiple packet data units (PDUs), may concatenate multiple ciphered data blocks to a PDU, or may generate one PDU from one data block. The outer ARQ entities may segment or re-segment the PDU when a transmission failure occurs. | 07-19-2012 |
20120192026 | Methods and Systems for Data Transmission Management Using HARQ Mechanism for Concatenated Coded System - Methods for data transmission management used in a transmitter are provided. The method comprises the steps of: encoding M uncoded packets into N coded packets with Q-packet error correction capability using concatenated encoding, where M≦N, and Q≧1; sequentially transmitting a set or all of the N coded packets to the at least one receiver; receiving at least one feedback information from the at least one receiver, wherein the at least one feedback information comprises at least one ACK or NACK information for indicating decoding statuses of the transmitted coded packets, each of the transmitted coded packets having one of the decoding statuses corresponding thereto; and determining whether to perform a retransmission procedure to retransmit a dedicated packet to the at least one receiver according to collected ACK/NACK included in the feedback information. | 07-26-2012 |
20120204075 | DATA PROCESSING METHOD AND APPARATUS FOR A HARQ OPERATION - A data processing method for a hybrid automatic repeat request (HARQ) is provided. Specifically, modulation can be performed according to a constellation rearrangement version (CRV) to generate a sub-packet for an incremental redundancy HARQ (IR-HARQ). When a constellation symbol modulated according to the CRV is segmented into an even symbol and an odd symbol for a plurality of transmit antennas, an identical CRV is determined for a pair of the even symbol and the odd symbol subsequent to the even symbol. When the constellation symbol modulated according to the CRV is transmitted to a receiving side, a newly generated sub-packet is retransmitted upon receiving a non-acknowledgement (NACK) signal. | 08-09-2012 |
20120210187 | DUAL REED-MULLER (RM) CODE SEGMENTATION FOR UPLINK CONTROL INFORMATION (UCI) - A method for reporting uplink control information (UCI) on a user equipment (UE) is described. It is determined a number of bits in a sequence of bits for transmission is greater than 11 and less than or equal to 21. The sequence of bits for transmission is segmented into a first segment and a second segment using a floor function. The first segment is encoded using a first Reed-Muller encoder. The second segment is encoded using a second Reed-Muller encoder. | 08-16-2012 |
20120240000 | METHOD OF RE-ORDERING RECEIVED DATA BLOCKS IN HYBRID AUTOMATIC REPEAT REQUEST TELECOMMUNICATION SYSTEM - A method of telecommunication transmits blocks of data between a user equipment and a station using parallel hybrid automatic repeat request processes. The station includes a scheduler that signals to the user equipment allocations of resources and parameters for transmission and re-transmission of the data blocks and a set of reception buffers that receive and re-order the data blocks from the user equipment. The scheduler assigns a reception index to the corresponding scheduled reception and assigning reception buffers to received data blocks as a function of the respective originally scheduled reception indexes identifying time slots scheduled for reception. A data block newly transmitted by the user equipment and received in its scheduled time slot is assigned to the reception buffer corresponding to the new reception index. A data block that is re-transmitted by the user equipment and received in a time slot later than its originally scheduled time slot is assigned to the reception buffer corresponding to the same reception index as its originally scheduled reception. The data blocks to which the scheduler assigns a reception index and a reception buffer of the set are Media Access Control Packet Data Units (‘MAC PDUs’). | 09-20-2012 |
20120278677 | PACKET TRANSMISSION APPARATUS, COMMUNICATION SYSTEM AND PROGRAM - A packet transmission apparatus to transmit a packet limited in arrival deadline through a best-effort network includes a packet automatic retransmission section to control retransmission of an undelivered packet, a forward error correction coding section to add redundant packet to a data packet block, and a redundancy determining section to dynamically determine redundancy of the redundant packet based on observed network state information so that a loss rate after error correction at a receiver achieved by only the retransmission of the undelivered packet satisfies an allowable loss rate after error correction. | 11-01-2012 |
20130019136 | Correction DataAANM Vafin; RenatAACI TallinnAACO EEAAGP Vafin; Renat Tallinn EEAANM Andersen; Soren VangAACI Esch-Sur-AlzetteAACO LUAAGP Andersen; Soren Vang Esch-Sur-Alzette LUAANM Nilsson; MattiasAACI SundbybergAACO SEAAGP Nilsson; Mattias Sundbyberg SE - Correction data units for data packets of a data stream are generated. A correction data unit is based on a set of the data packets of the stream. The stream is transmitted over a lossy communication channel. A performance measure to be optimized is selected, which relates to the recovery of lost data packets of the stream. A coding requirement is determined. For the generation of the correction data units, it is determined, within the constraints of the coding requirement and based on previously generated correction data units, which of the data packets in the stream to include in the set on which the generation of the correction data unit is to be based to thereby optimize the selected performance measure. A generated correction data unit is generated based on a respective set of the data packets of the stream. The generated correction data units are included in the stream. | 01-17-2013 |
20130019137 | ENCODER, DECODER, ENCODING METHOD, AND DECODING METHOD - A decoder that includes a receiving unit that receives a packet containing a new part corresponding to an information bit not yet received and a retransmission part corresponding to an information bit received in past; a combining unit that combines a part of a previously received packet corresponding to the retransmission part with the packet received by the receiving unit; and a new-part decoding unit that decodes the combined packet combined and obtained by the combining unit, and obtains a decoded result of the new part. | 01-17-2013 |
20130047051 | HARQ PROCEDURE WITH PROCESSING OF STORED SOFT-BITS - It is described a method for determining a received data block by employing a Hybrid Automatic Repeat Request procedure. The described method comprises calculating ( | 02-21-2013 |
20130117622 | Method and System for Up-Link HARQ-ACK and CSI Transmission - A method and user equipment for simultaneous transmission of a first set of information bits and a second set of information bits by a user equipment, either separately encoded utilizing transmit power or rate matching to increase successful decoding of a set of information bits, or jointly encoding using a priori knowledge or bit positioning to increase successful decoding. Also, the use of joint coding where a first set of information bits is encoded first and then encoded with a second set of information bits, and modulation symbol mapping are provided. | 05-09-2013 |
20130139020 | METHOD OF TRANSMITTING DATA USING CONSTELLATION REARRANGEMENT - A data retransmission method using hybrid automatic repeat request (harq) includes transmitting a data block, receiving a retransmission request signal for the data block, generating a retransmission block by performing swapping or inversion between bits constituting the data block according to the retransmission request signal, and transmitting the retransmission block. | 05-30-2013 |
20130159808 | System for Communicating Data in xDSL Using Data Retransmission - Embodiments described herein provide an apparatus for transmitting data in an xDSL. In one example, the apparatus can include a transmitter configured to transmit data over the xDSL system in the form of data transmission units (DTUs), the transmitter having a physical media specific-transmission convergence (PMS-TC) communication sublayer and a retransmission unit that is implemented in the PMS-TC sublayer, the retransmission unit including a retransmission buffer configured to store transmitted DTUs and to index the transmitted DTUs using retransmit containers, each retransmit container being defined as a time slot corresponding to a respective sent DTU. A retransmit request specifies a DTU by a corresponding retransmit container and wherein the retransmission unit is configured to retransmit the specified DTU in response to the retransmit request. | 06-20-2013 |
20130246876 | Method and Arrangement for Retransmission Control - A method and arrangement for retransmission control. A method in a sending system entity for controlling retransmissions of data to a sending system entity is provided. Initial data encoded with a first forward error correction code is sent | 09-19-2013 |
20130262952 | MEMORY ARCHITECTURE FOR TURBO DECODER - Disclosed are various embodiments that provide turbo decoding implemented as at least a portion of baseband processing circuitry. An input bit stream may be divided into a set of code blocks and a first code block may be separated from the set of code blocks. A hybrid automatic repeat request (HARQ) process is performed on the first code block to generate a processed first code block. The processed first code block is stored in an incremental redundancy (IR) buffer. A turbo decoding process is performed on the processed first code block to generate decoded first code block data and the decoded first code block data is stored in an external memory. The processed first code block is removed from the IR buffer for decoding a remaining portion of the set of code blocks. | 10-03-2013 |
20130339813 | METHOD AND SYSTEM FOR EFFICIENT ERROR FREE PACKET RECEPTION USING HYBRID AUTOMATIC REPEAT-REQUEST (HARQ) IN A WIRELESS COMMUNICATION SYSTEM - The present invention relates to a method and system for efficient error free packet reception using hybrid automatic repeat-request (HARQ) in a wireless communication system. In one embodiment this is accomplished by receiving in a plurality of modulated digital data as transmission signal at a receiver transmitted through a plurality of transmission paths from a transmitter, demodulating the received transmission signals, estimating the difference between the received transmission signals and the ideal expected signal constellation in order to determine the weights for each constellation symbols, applying the determined weights for each symbol-wise of the received transmission data, storing the weighted data as final data in a buffer of a HARQ combining unit and processing the stored final data to determine whether the received data frames are correct. | 12-19-2013 |
20140032988 | COMMUNICATION APPARATUS, TERMINAL APPARATUS AND COMMUNICATION METHOD - A loss correction encoding device having an improved capability of loss correction using LDPC-CC includes a rearranging unit that rearranges information data contained in n information packets according to the constraint length Kmax and the encoding rate (q−1)/q of a check polynomial of the loss correction code used in a loss correction encoding unit. Specifically, the rearranging unit rearranges the information data in such a way that continuous Kmax×(q−1) pieces of information data after rearrangement are contained in different information packets. The rearranging unit distributes the information data to information blocks from n information packets, where n satisfies the formula Kmax×(q−1)≦n. | 01-30-2014 |
20140059400 | Hybrid Automatic Repeat-Request Combination for Wireless Transmissions - In one embodiment, a method for data communication may include receiving a first set of soft bit values in a Hybrid Automatic Repeat-Request (HARQ) buffer using a first bit width. The method may also include soft combining the first set of soft bit values with a second set of soft bit values to obtain a set of combined soft bit values. The method may also include transforming the set of combined soft bit values from the first bit width to a decoder input bit width to obtain a set of transformed soft bit values. | 02-27-2014 |
20140075260 | TRANSMISSION METHOD USING PARITY PACKETS, TRANSMITTER AND REPEATER - Problem: A packet error rate in a receiver needs to be effectively reduced. | 03-13-2014 |
20140101508 | HYBRID ERROR-CONTROL ALGORITHM - An embodiment of the invention includes an efficient error-control system and method for recovering packet losses, especially losses in distributing multicast video over broadband residential networks. Preferably, unlike most existing error-control algorithms designed for Internet multicast, the system and method does not employ substantial feedback suppression. Preferably, the system and method does not employ substantial multicasted retransmission. Preferably, the system and method does not employ substantial parity retransmission. Preferably, the system and method does not employ substantial local loss recovery. The system and method integrates two existing classes of error-control algorithms: Automatic Repeat Request (ARQ) and Forward Error Correction (FEC), to reduce traffic overhead and achieve scalability. | 04-10-2014 |
20140108879 | USING FEC STATISTICS TO TUNE SERDES - Serializer-Deserializer (SerDes) operation is optimized for signals based on signal error statistics. Forward Error Correction (FEC) may provide feedback of error statistics or error correction statistics to a SerDes tuner, which uses the statistics to selectively tune or adjust SerDes operating parameters, such as vertical and horizontal sampling or slicing offsets, gain and equalization, to decrease the bit error rate (BER). Statistics report which bits and patterns are corrected and to what values. Knowledge of expected and actual signals is leveraged to correlate detected errors with underlying problems and solutions to optimize SerDes operation. Each node in a network, such as a Ethernet Passive Optical Network (EPON), is enabled to fine tune its operation independently for each logical or physical channel. | 04-17-2014 |
20140173372 | System and Method for Terminal-Group Based HARQ for Cellular Integrated D2D Communications - System and method embodiments are provided to support network communications with groups of UEs. The embodiments include a two-level group-based hybrid-automatic repeat request (HARQ) mechanism and acknowledgement (ACK)/negative ACK (NACK) feedback. An embodiment method includes receiving, at a UE within a virtual multi-point (ViMP) comprising UEs, a data packet for a target UE (TUE) that is broadcasted from a base station (BS) to the ViMP node, decode the data packet, and upon successfully decoding the data packet, broadcasting the data packet to the UEs within the ViMP node until a timer pre-established by the BS expires or an ACK message is received from the TUE or the ViMP node. In an embodiment, broadcasted data received in the ViMP node is re-broadcasted upon receiving a negative acknowledgment (NACK) message from the TUE, a beacon UE, or any of the UEs within the ViMP node. | 06-19-2014 |
20140181611 | System and Method for Mitigating Burst Noise in a Communications System - A system, method and computer program product is provided for mitigating the effects of burst noise on packets transmitted in a communications system. A transmitting device applies an outer code, which may include, for example, a block code, an exclusive OR (XOR) code, or a repetition code, to one or more packets prior to adaptation of the packets for transmission over the physical (PHY) layer of the communications system, wherein the PHY layer adaptation may include FEC encoding of individual packets. The outer coded packets are then separately transmitted over a channel of the communications system. A receiving device receives the outer coded packets, performs PHY level demodulation and optional FEC decoding of the packets, and then applies outer code decoding to the outer coded packets in order to restore packets that were erased during transmission due to burst noise or other impairments on the channel. | 06-26-2014 |
20140195872 | SIMULTANEOUS DATA TRANSFER AND ERROR CONTROL TO REDUCE LATENCY AND IMPROVE THROUGHPUT TO A HOST - The disclosed embodiments provide a system that transfers data from a storage device to a host. The system includes a communication mechanism that receives a request to read a set of blocks from the host. Next, upon reading each block from the set of blocks from the storage device, the communication mechanism transfers the block over an interface with the host. The system also includes an error-detection apparatus that performs error detection on the block upon reading the block, and an error-correction apparatus that performs error correction on the block if an error is detected in the block. The communication mechanism may then retransfer the block to the host after the error is removed from the block. | 07-10-2014 |
20140201587 | FEC-BASED RELIABLE TRANSPORT CONTROL PROTOCOLS FOR MULTIPATH STREAMING - A client device includes one or more processors configured to receive, from a server device, forward-error corrected data via a plurality of parallel network paths, determine losses of the data over each of the network paths, and send data representing the losses of the data over each of the network paths to the server device. Additionally or alternatively, a client device includes one or more processors configured to receive a first set of encoding units for a first block, wherein the first set of encoding units includes fewer than a minimum number of encoding units needed to recover the first block, after receiving the first set of encoding units, receive a second set of encoding units for a second block, and after receiving the second set of encoding units, receive a third set of encoding units including one or more encoding units for the first block. | 07-17-2014 |
20140258801 | MANAGING NULL PACKETS - Systems and methods are provided for mitigating interference in a wireless network to facilitate network performance. In an aspect, a method for transmitting wireless data packets is provided. The method includes receiving data packets from a wireless distribution network. The data packets are analyzed to determine if a subset of the data packets are to be suppressed in view of transmitter signal conditions and substituting null packets for the subset of data packets if the subset of data packets are determined to be suppressed. | 09-11-2014 |
20140289581 | COOPERATIVE COMMUNICATION SYSTEM WITH ADAPTIVE PACKET RETRANSMISSION STRATEGY - The invention proposes a method for the transmission of data in a cooperative network comprising a source terminal (S), a destination terminal (D) and a relay terminal (R), comprising:
| 09-25-2014 |
20140304565 | DECODING METHOD - A decoding method for decoding information content in at least one data packet, which is transmitted from a sender to a receiver via a data link. The information is represented by a bit sequence, which is transformed into a transmittable redundancy version. The information is initially transmitted for a first time in a first data packet from the sender to the receiver. The information is represented by a first redundancy version, which is self-decodable. An incorrect receipt is confirmed by sending a confirmation from the receiver to the sender. The information is retransmitted at least a second time in a second data packet from the sender to the receiver upon receipt of the confirmation, wherein, for representation of the information, a second redundancy version is used, the selection of which is performed in dependence on a coding parameter, describing whether the redundancy version is self-decodable or not. | 10-09-2014 |
20140325302 | Reliable Multicast Broadcast in Wireless Networks - A mechanism is provided for transmitting a multicast session to a plurality of receivers over a wireless network. A forward error correction (FEC) overhead and a transmission rate are determined for transmission of a next data block of the multicast session based on received channel conditions. The next data block is multicast using the determined FEC overhead and transmission rate. Responsive to an indication of common missing packets from the next data block from more than one receiver in the plurality of receivers, the common missing packets are multicast to the plurality of receivers using the determined FEC overhead and transmission rate. Responsive to an indication of uncommon missing packets from the data block from one or more receivers, for each receiver in the one or more receivers, the uncommon missing packets identified by the receiver are unicast using the determined FEC overhead and transmission rate. | 10-30-2014 |
20140359389 | APPARATUS, METHOD AND COMPUTER PROGRAM PRODUCT FOR ERROR CORRECTION IN VARIABLY RELIABLE AND/OR HIERARCHICAL NETWORKS - A file is multicast from an error-correcting multicast apparatus to a plurality of endpoints forming a first multicast group, over a network segmented into at least second and third multicast groups. The second and third multicast groups are subsets of the first multicast group. Given ones of the endpoints are assigned to the second and third multicast groups based on likelihood of experiencing similar errors. At the error-correcting multicast apparatus, over the network, a retransmission request is obtained from a first one of the endpoints, based on at least one of loss and corruption of a portion of the file during the multicasting of the file to the first one of the endpoints. The portion of the file is retransmitted, via multicasting, over the network, to one of the second and third multicast groups. | 12-04-2014 |
20150149850 | Device Performance Monitoring - A computing device performance monitor may be configured to collect performance metric information regarding one or more monitored computing devices, and may assign condition point values to each metric. The performance monitor may generate a total of the condition point values, and use the total to determine an appropriate response. | 05-28-2015 |
20180026751 | POLAR CODE HYBRID AUTOMATIC REPEAT REQUEST METHOD AND APPARATUS | 01-25-2018 |