Arrangements for detecting or preventing errors in the information received

HELECTRICITY H04Electric communication H04LTRANSMISSION OF DIGITAL INFORMATION

H04L1/00Arrangements for detecting or preventing errors in the information received

H04L1/0001Systems modifying transmission characteristics according to link quality H04L1/0002by adapting the transmission rate H04L1/0003by switching between different modulation schemes H04L1/0004applied to control information H04L1/0005applied to payload information H04L1/0006by adapting the transmission format H04L1/0007by modifying the frame length H04L1/0008by supplementing frame payload H04L1/0009by adapting the channel coding H04L1/001applied to control information H04L1/0011applied to payload information H04L1/0013Rate matching H04L1/0014by adapting the source coding H04L1/0015characterised by the adaptation strategy H04L1/0016involving special memory structures H04L1/0017where the mode-switching is based on Quality of Service requirement H04L1/0018based on latency requirement H04L1/0019in which mode-switching is based on a statistical approach H04L1/002Algorithms with memory of the previous states H04L1/0021in which the algorithm uses adaptive thresholds H04L1/0022in which mode-switching is influenced by the user H04L1/0023characterised by the signalling H04L1/0025Transmission of mode-switching indication H04L1/0026Transmission of channel quality indication H04L1/0027Scheduling of signalling H04L1/0028Formatting H04L1/0029Reduction of the amount of signalling H04L1/003Adaptive formatting arrangements particular to signalling H04L1/0031Multiple signaling transmission H04L1/0032Without explicit signalling H04L1/0033arrangements specific to the transmitter H04L1/0034where the transmitter decides based on inferences H04L1/0035evaluation of received explicit signalling H04L1/0036arrangements specific to the receiver H04L1/0038Blind format detection H04L1/0039other detection of signalling H04L1/004by using forward error control H04L1/0041Arrangements at the transmitter end H04L1/0042Encoding specially adapted to other signal generation operation H04L1/0043Realisations of complexity reduction techniques H04L1/0044specially adapted for power saving H04L1/0045Arrangements at the receiver end H04L1/0046Code rate detection or code type detection H04L1/0047Decoding adapted to other signal detection operation H04L1/0048in conjunction with detection of multiuser or interfering signals H04L1/005Iterative decoding, including iteration between signal detection and decoding operation H04L1/0051Stopping criteria H04L1/0052Realisations of complexity reduction techniques H04L1/0053specially adapted for power saving H04L1/0054Maximum-likelihood or sequential decoding H04L1/0055MAP-decoding H04L1/0056Systems characterized by the type of code used H04L1/0057Block codes H04L1/0058Block-coded modulation H04L1/0059Convolutional codes H04L1/006Trellis-coded modulation H04L1/0061Error detection codes H04L1/0063Single parity check H04L1/0064Concatenated codes H04L1/0065Serial concatenated codes H04L1/0066Parallel concatenated codes H04L1/0067Rate matching H04L1/0068by puncturing H04L1/0069Puncturing patterns H04L1/007Unequal error protection H04L1/0071Use of interleaving H04L1/0072Error control for data other than payload data H04L1/0073Special arrangements for feedback channel H04L1/0075Transmission of coding parameters to receiver H04L1/0076Distributed coding H04L1/0077Cooperative coding H04L1/0078Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors H04L1/0079Formats for control data H04L1/008where the control data relates to payload of a different packet H04L1/0081Formats specially adapted to avoid errors in the feedback channel H04L1/0082fields explicitly indicating existence of error in data being transmitted H04L1/0083Formatting with frames or packets; Protocol or part of protocol for error control H04L1/0084Formats for payload data H04L1/0085Formatting with cells H04L1/0086Unequal error protection H04L1/0088in control part H04L1/0089in payload H04L1/009arrangements specific to transmitters H04L1/0091arrangements specific to receivers H04L1/02by diversity reception H04L1/04using frequency diversity H04L1/06using space diversity H04L1/0606Space-frequency coding H04L1/0612Space-time modulation H04L1/0618Space-time coding H04L1/0625Transmitter arrangements H04L1/0631Receiver arrangements H04L1/0637Properties of the code H04L1/0643block codes H04L1/065by means of convolutional encoding H04L1/0656Cyclotomic systems H04L1/0662Limited orthogonality systems H04L1/0668Orthogonal systems H04L1/0675characterised by the signaling H04L1/0681adapting space time parameters H04L1/0687Full feedback H04L1/0693Partial feedback H04L1/08by repeating transmission H04L1/12by using return channel H04L1/14in which the signals are sent back to the transmitter to be checked echo systems H04L1/16in which the return channel carries supervisory signals H04L1/1607Details of the supervisory signal H04L1/1614using bitmaps H04L1/1621Group acknowledgement, i.e. the acknowledgement message defining a range of identifiers H04L1/1628List acknowledgements, i.e. the acknowledgement message consisting of a list of identifiers H04L1/1635Cumulative acknowledgement H04L1/1642Formats specially adapted for sequence numbers H04L1/165Variable formats H04L1/1657Implicit acknowledgement of correct or incorrect reception H04L1/1664the supervisory signal being transmitted together with payload signals; piggybacking H04L1/1671the supervisory signal being transmitted together with control information H04L1/1678where the control information is for timing H04L1/1685the supervisory signal being transmitted in response to a specific request H04L1/1692Physical properties of the supervisory signal H04L1/18Automatic repetition systems H04L1/1803Stop-and-wait protocols H04L1/1806Go-back-N protocols H04L1/1809Selective-repeat protocols H04L1/1812Hybrid protocols H04L1/1816with retransmission of the same, encoded, message H04L1/1819with retransmission of additional or different redundancy H04L1/1822involving configuration of ARQ with parallel processes H04L1/1825Adaptation of specific ARQ protocol parameters according to transmission conditions H04L1/1829Arrangements specific to the receiver end H04L1/1832Details of sliding window management H04L1/1835Buffer management H04L1/1838for semi-reliable protocols H04L1/1841Resequencing H04L1/1845Combining techniques H04L1/1848Time-out mechanisms H04L1/1851using multiple timers H04L1/1854Scheduling and prioritising arrangements H04L1/1858Transmission or retransmission of more than one copy of acknowledgement message H04L1/1861Physical mapping arrangements H04L1/1864ARQ related signaling H04L1/1867Arrangements specific to the transmitter end H04L1/187Details of sliding window management H04L1/1874Buffer management H04L1/1877for semi-reliable protocols H04L1/188Time-out mechanisms H04L1/1883using multiple timers H04L1/1887Scheduling and prioritising arrangements H04L1/189Transmission or retransmission of more than one copy of a message H04L1/1893Physical mapping arrangements H04L1/1896ARQ related signaling H04L1/20using signal quality detector H04L1/201Frame classification H04L1/203Details of error rate determination H04L1/205jitter monitoring H04L1/206for modulated signals H04L1/208involving signal re-encoding H04L1/22using redundant apparatus to increase reliability H04L1/24Testing correct operation H04L1/241using pseudo-errors H04L1/242by comparing a transmitted test signal with a locally generated replica H04L1/243at the transmitter, using a loop-back H04L1/244test sequence generators H04L1/245by using the properties of transmission codes H04L1/246two-level transmission codes H04L1/247three-level transmission codes H04L1/248Distortion measuring systems