Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L1/00—Arrangements for detecting or preventing errors in the information received
  • H04L1/24—Testing correct operation
  • H04L1/242—Testing correct operation by comparing a transmitted test signal with a locally generated replica
  • H04L1/244—Testing correct operation by comparing a transmitted test signal with a locally generated replica test sequence generators
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L1/00—Arrangements for detecting or preventing errors in the information received
  • H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L1/00—Arrangements for detecting or preventing errors in the information received
  • H04L1/24—Testing correct operation
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
  • H04W52/04—TPC
  • H04W52/18—TPC being performed according to specific parameters
  • H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
  • H04W52/04—TPC
  • H04W52/18—TPC being performed according to specific parameters
  • H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
  • H04W52/267—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account the information rate
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L12/00—Data switching networks
  • H04L12/54—Store-and-forward switching systems 
  • H04L12/56—Packet switching systems
  • H04L12/5601—Transfer mode dependent, e.g. ATM
  • H04L2012/5603—Access techniques

Definitions

• a certain previously negotiated number of test sequences are transmitted from a communication device (e.g., modem) associated with a subscriber at, for example, different baud rates received from another communication device connected to the sending communication device via the transmission medium.
• a communication device e.g., modem
• test sequences are ter by predetermined Testmus ⁇ which are known to the communication devices.
• Testmus ⁇ which are known to the communication devices.
• the respective transmission quality or signal quality is subsequently determined for each received test sequence.
• the received test pattern is compared with the known original pattern.
• the compound can be delivered Since ⁇ tenübertragungsrate be continued with the identified in the training phase, the optimal transmission quality.
• the invention has the object of fibers, the method for determining an optimum data transfer rate to verbes ⁇ . This object is achieved on the basis of a method according to the features of the preamble of patent claim 1 by its characterizing features.
• Se ⁇ are respectively frequencies transmitted via the transmission medium and determines the transmission quality as a function of the sequences in each case transmitted.
• the essential aspect of the invention be ⁇ is the fact that the associated information to be several sequences chronologically successive stages. Furthermore, the sequences assigned to a stage have a predefinable distance with regard to the data transmission rate. The following steps are carried out: a) transmitting at least a portion of one stage zugeord ⁇ Neten sequences and selecting one arranged between two transmitted sequences interval in dependence on the determined transmission quality, and b) transmitting at least a portion of the in-selected interval and the subsequent Stage assigned sequences.
• the essential advantage of the invention is that the assignment of the test sequences to a plurality of chronologically successive stages allows a more accurate determination of the data transmission rate which is optimal for the transmission of information.
• the above-mentioned steps a) and b) can be ⁇ the run several times cyclically - claim. 2
• sequences can further advantageously with different transmission methods, are transmitted eg also different modulation methods and / or different transmit power - claims 2 and 3. Since ⁇ by optimizing the data transfer rate is further improved.
• the above-mentioned steps can also be carried out until either a maximum number of test sequences has been transmitted or until a predefined number of stages have been passed through - claims 4 and 5.
• the number of stages can be chosen so that two adjacent in the last stage test sequences with respect to their data transfer as close as possible distance - claim 7.
• this smallest possible distance also has the value one on - claim 8.
• the distances between the test sequences assigned to one stage become lower in the chronologically succeeding stages.
• Claim 9 Advantageously, the distances between test sequences of the same stage can be reduced. hernd have the same value - claim 10.
• the essential characteristic of these enhancements is a speedier Ver ⁇ ring réelle the distances between adjacent test sequences with each succeeding stage, whereby the exact determination of the optimal data transmission rate is achieved more quickly.
• connection setup training ⁇ phase is a schematic representation of the time sequence of taking place between two communication units in the context of the connection setup training ⁇ phase according to the prior art
• FIG. 2 is a schematic representation of the exemplary determination of the optimal transmission rate in the context of the training phase according to FIG. 1, FIG.
• Fig. 3 is a schematic representation of the timing of the training phase as part of the invention shown SEN method.
• FIG. 4 shows a detailed schematic illustration of the exemplary determination of the optimum transmission rate in the context of the method according to the invention.
• Fig. 1 shows a schematic representation of the known timing of the training phase during the connection ⁇ structure in a prior art attributable telecommunications arrangement, which in this embodiment configured according to the SHDSL method.
• the quality of test sequences is compared with USAGE ⁇ dung different baud rates.
• n predetermined test sequences (TS 1,..., TSn), each having different, increasing baud rates, are transmitted from one communication device to another communication device to determine the optimum baud rate when establishing a connection by means of a handshake method, the quality of the received ⁇ recorded and determined.
• Handshake procedure generally means that the parameters for data transmission are negotiated between the two communication devices by means of so-called two-way handshake signals (HS) and transmission or readiness for reception are displayed.
• HS two-way handshake signals
• the quality of the received signals is detected by the receiver, for example, based on a comparison of the genes are received, ⁇ test pattern with the predetermined original pattern. The results of this quality tests are then communicated to the sen ⁇ Denden communication device.
• the transmitter determines the optimum baud rate for the subsequent transmission of the user data based on the test results. For this purpose, the highest baud rate is selected at which sufficient quality of the information to be transmitted is still achieved. Subsequently, the transmission of the actual user data (data) begins.
• the signal quality can adversely not be tested accurately for all baud rates.
• the signal quality can be therefore only be determined by interpolation. This particular during the interpolation baud rates are, however, as already explained inaccurate, which at too low Emp ⁇ catch quality transmission error in the subsequent transmission of information and at a high quality non-optimal utilization of the resources of the transmission ⁇ stretch consequence has.
• Fig. 2 shows an exemplary sequence of generally Moegli m ⁇ chen baud rates (DRL, ... DRm).
• each n is an ⁇ be agreed baud rate (DRL, ... DRm) representing Testsequen zen ⁇ (, ..., TSn TSL) transmitted.
• DRL ⁇ be agreed baud rate
• TSn TSL Testsequen zen ⁇
• test sequences TS1 to TS10 are assigned the baud rates DR3, DR9, DR15, DR22, DR29, DR36, DR43, DR50, DR57 and DR64.
• TSl 0.1, TSLO
• the signal quality is present at ⁇ play, in the lower-valued baud rate DR43 still larger than a required minimum Signalqua ⁇ notes, wherein a higher value having baud rate DR50, however, already lower than said minimum quality so must be the exact value of the optimum, for the transmission of information Baud rate can be determined by interpolation of the values for DR43 and DR50 (here eg DR47). The optimal baud rate is thus approximated but not exactly verified.
• FIG. 3 shows a schematic representation of the time sequence of the training phase between two communication devices (not shown) connected to one another via a transmission medium in the context of the method according to the invention.
• a communication device for example, as a mapped to the subscriber modem out ⁇ forms be the corresponding communication device may for example be a central switch be assigned.
• information is transmitted as part of the SHDSL transmission method, again 67 stingliche under ⁇ baud rates are available for the transmission of information, but as part of the training phase, a maximum of ten test sequences (TS, ..., TSLO) are emitted can.
• the test sequences used are assigned to several stages (stage, stage 2, stage 3).
• stage, stage 2, stage 3 the first stage (Stufel), for example, only three test sequences (TS1, TS2, TS3) are transmitted, ie transmitted by the modem and received in the switching device or vice versa.
• HS handshake signal
• the detection of the transmission quality or signal quality as a function of the transmitted sequences or test sequences can take place in different ways.
• ⁇ play the amplitude and / or the bit error rate of the received signals can be detected, but it is usual to determine the signal-to-noise ratio (SNR) from a comparison of the known original test pattern with the received sequence (TS, ..., TSn ).
• SNR signal-to-noise ratio
• the received communication device for each received sequence (TS, ..., TSn) whose amplitude or signal-to-noise ratio is respectively detected or measured and an information representing the detection result, for example in Frame of the handshake method to the sending communication ⁇ tion device transmitted.
• the amplitude or signal-to-noise ratio of exemplary meh ⁇ received sequences (TS, ..., TSn) is detected and closing at ⁇ transmits a summary of the detection results of information representing the emitting Kommunikati ⁇ ons pain.
• the transmission quality can be determined from the data transmitted to the originating communication device detection results (for example, values for signal-to-noise ratio) or ask ⁇ passes are.
• the transmission quality and the transmission quality representing Informati ⁇ on or derived from the transmission quality Steuerinfor ⁇ mation to the emitting communication device be transmitted.
• test sequences TS, ..., TSn
• TS further test sequences
• the selection of the baud rates (DRI, ..., DRm) for the individual test sequences (TS, ..., TS n) and the erfindungsge ⁇ Permitted assignment of test sequences (TS, ..., TS n) to the individual stages (Stufel , Stage 2, Stage 3) is shown schematically in FIG. 4.
• TS1, TS2, TS3 with the baud rates DR16, DR33 and DR50 are tested.
• the span of all baud rates (DR1,..., DR67) possible in this example is thus divided into intervals of the same size (111, 112, 113, 114). Based on the signal qualities The first three test sequences (TS1, TS2, TS3) of the first stage (Stufel) are then determined at which interval
• the optimum for the connection baud rate must be located: in this example, the Signalqua ⁇ is formality at baud rate DR33 still larger than the required mini ⁇ male signal quality at the higher baud rate DR50, however, the quality is already less than the minimum quality.
• test sequences (Stage 2, Stage 3) test sequences (TS4, ..., TS9), focuses on the interval (113) between baud rates DR33 and DR50.
• the signal qualities of the test sequences TS4, TS5 and TS6 with the corresponding baud rates DR38, DR42 and DR46 are then tested. Again, the Inter ⁇ vall is previously determined (113) or this interval (113) associated baud rates ⁇ (DR33 DR50 up) in approximately equal sub-intervals (121, 122, 123, 124) divided.
• the test results of the two ⁇ th stage (step 2) are transmitted by handshake signals and it is determined again, in which the new sub-interval (123), the optimal baud rate must be located. As can be seen in Figure 4, the new subinterval (123) is located between baud rates DR42 and DR46.
• stage3 the signal qualities of the test sequences TS7, TS8 and TS9 with the appropriate baud rates DR43, DR44 detected DR45 and determined and depending on the determination result is true, the optimum for the current connection baud rate finally be ⁇ (or in this case be: DR45).
• the detected signal qualities are examined, for example, as of which baud rate
• stage 3 the signal quality of a test sequence transmitted and received in the third stage (stage 3)
• TS7, TS8, TS9 the required minimum quality first un ⁇ terschreitet.
• the payload data following the training phase Transmission is then this phase during the beginnings Trai ⁇ certain baud rate (here: DR45) is performed.
• test sequences using different modulation methods (about PAML 6 or PAM32 or PPM or QAM) to generate and transmit at multiple power levels. It would also be possible to provide for the implementation of the method according ⁇ proper test sequences with other different transmission parameters.

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• Engineering & Computer Science (AREA)
• Computer Networks & Wireless Communication (AREA)
• Signal Processing (AREA)
• Quality & Reliability (AREA)
• Communication Control (AREA)
• Detection And Prevention Of Errors In Transmission (AREA)

Applications Claiming Priority (2)

Publications (1)

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• 2005
  • 2005-02-15 DE DE102005006890A patent/DE102005006890B4/de active Active
• 2006
  • 2006-01-24 EP EP06701282A patent/EP1849253A1/de not_active Withdrawn
  • 2006-01-24 KR KR1020077020205A patent/KR101296728B1/ko not_active IP Right Cessation
  • 2006-01-24 CN CN2006800049543A patent/CN101120533B/zh not_active Expired - Fee Related
  • 2006-01-24 US US11/884,064 patent/US20080183923A1/en not_active Abandoned
  • 2006-01-24 WO PCT/EP2006/050387 patent/WO2006087255A1/de active Application Filing

Non-Patent Citations (1)

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