WO2001052464A1 - Method for adaptively adjusting a table of data rate options for xdsl data transmission methods, said table being adapted to lines and disturbances - Google Patents

Method for adaptively adjusting a table of data rate options for xdsl data transmission methods, said table being adapted to lines and disturbances Download PDF

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Publication number
WO2001052464A1
WO2001052464A1 PCT/DE2000/004663 DE0004663W WO0152464A1 WO 2001052464 A1 WO2001052464 A1 WO 2001052464A1 DE 0004663 W DE0004663 W DE 0004663W WO 0152464 A1 WO0152464 A1 WO 0152464A1
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WO
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Prior art keywords
table
values
data transmission
characterized
data transfer
Prior art date
Application number
PCT/DE2000/004663
Other languages
German (de)
French (fr)
Inventor
Thomas Ahrndt
Original Assignee
Siemens Aktiengesellschaft
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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L29/00Arrangements, apparatus, circuits or systems, not covered by a single one of groups H04L1/00 - H04L27/00 contains provisionally no documents
    • H04L29/02Communication control; Communication processing contains provisionally no documents
    • H04L29/06Communication control; Communication processing contains provisionally no documents characterised by a protocol
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/14Two-way operation using the same type of signal, i.e. duplex
    • H04L5/1438Negotiation of transmission parameters prior to communication
    • H04L5/1446Negotiation of transmission parameters prior to communication of transmission speed
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00Application independent communication protocol aspects or techniques in packet data networks
    • H04L69/24Negotiation of communication capabilities

Abstract

The present invention relates to a method for establishing a connection for the data transmission between a switching centre (2) and a user (1), said data being transmitted at a certain data transmission rate. The inventive method comprises the steps: providing a table (21) having a certain number of pre-adjusted values, detecting the maximally possible data transmission rate (23) and adjusting the data transmission rate. The invention also relates to a device for carrying out said method.

Description

description

transmission process procedure for adaptive creation of a circuit- and Stor adapted table of data rate options for xDSL Datenuber-

The present invention relates to a method for establishing a connection for the purpose of data transmission between a switching center and a subscriber at a particular data transfer rate as described in the preamble of annexed claim 1 and an apparatus for carrying out this method, as described in beigef GTEN claim 8 ,

Modern exchanges in the electronic voting system digital (EWSD) s nd already m able to participants in addition to the analog or digital Telefond most in POTS (Plain Old Telephone Service) or ISDN system also high bit rate data services in xDSL (x digital Subscπber Line) process to provide. So (Asymmetric Digital Subscπber line) method from the exchange to the subscriber is already a data transfer rate of up to 8 Mbit / s and up to 640 kbit / s in the opposite direction is possible for example in ADSL.

The interface between the subscriber and the central office or the transmission network is the line module (also line card or SLMI, Subscriber Line Module Internet called), located m the exchange. several participants are on a line module (eg 8 students) with their Endgeraten (eg analog phone and PC) connected.

On the output side, this line modules grout through a PCM interface (pulse-code modulation) for transmission of voice data ms voice network. In addition, d-ase grout line modules on the output side via an interface (such as in the frame relay, Ethernet, or ATM system) to the packet-th data transmission a data transmission network with high data transfer rates.

The connection establishment between the subscriber and his Endgeraten to the exchange takes place in several steps. Part of the connection set-up is the so-called training phase of the characteristics of the Uber- tragungsleitung eg in terms of the signal / noise ratio and thus the maximum possible data transfer rate ermit- telt. The maximum possible data transfer rate is, for example, depending on the nature of the conduit, the length of the line and external factors such as age, temperature, and for overhead lines in addition to the weather.

According to the standard ITU G.992.2 (or G.lite) is the line module during connection setup, a table with four values ​​for the data transmission rate from the subscriber to the exchange and vice versa for grouting, ie the data transmission can be m any direction one of the four corresponding have values. This table is loaded before the training phase and can not be changed in the course of the connection. The table may look as follows: For data transmission to the subscriber (data downstream) are the values ​​2, 4, 6 and 8 Mbit / s and for data transmission to the exchange (Data Upstream) are the values ​​80, 160, 320 and 640 kbit / s for disposal. Be in the training phase, for example, the values ​​of 4.5 Mbit / s and 90 kbit / s identified as the maximum possible data transfer rates, then each nachstniedrigeren values ​​of the table are defined as actual data transfer rates. In the example, these are the values ​​4 Mbit / s data downstream and 80 kbit / s data upstream.

The disadvantage of the method described is that the table only darstdJ.lt a very coarse grid. Were in the mentioned case, for example, 5.5 Mbit / s data downstream and 150 kbit / s upstream data as the maximum data transfer rate possible, so also were the nachstniedrigeren values, in the example given corresponding to 4 Mbit / s or 80 kbit / s be set as tatsachliche data transfer rate. Thus, the actual set Datenuber- are transfer rates significantly lower than the data transfer rates that could be achieved by making the most lines in general.

In the prior art, this disadvantage is either taken into account, or the line is a so-called pre-

Loop qualification m different categories, such as short, medium or long lines. then stands for the corresponding line lengths each have a different table of values ​​for data transfer rates to supply Verfu-, wherein the values ​​of the data transfer rate e are high, the more short the line.

However, the pre-loop qualification of the line requires extra effort: each cable to the party h must be measured one individually. a table is obtained from the values ​​thus determined for each line then created, which is preset for each connection. In this case, it is not considered that the conduction properties can others, for example due to aging effects.

The object of the present invention is thus to provide a method for establishing a connection for the purpose of data transmission between a switching center and a subscriber according to the preamble of the annexed claim 1 and an Vorrich- processing for carrying out this method according to the preamble of the annexed claim 8 to provide, with a better adjusting the data transmission rate is made possible to the given conductive properties.

This object is achieved by a method for Verbiadungsaufbau for the purpose of data transmission between a switching center and a subscriber in accordance with the annexed claim 1 and an apparatus for carrying out this-it method according to the appended claim. 8

According to the present invention, after determining and inputs represent the data transfer rate on each of a table value for the data transmission from the subscriber to the exchange and vice versa the content of which is loaded prior to the training phase the table, recalculated, the table values ​​are calculated so that they a lower deviation have as the default table values.

In contrast to a recalculation of the table could be used to access an existing selection tables with values ​​for data transfer rates, the table is selected from the that comes to current conduction properties closest.

The calculation is carried out based on the determined maximum possible data transfer rate. The contents of the new (second) table is in a repeat of the connection setup for the data transfer to the disposal.

By the recalculation and the repeating of the connection setup is achieved that the transmission system a GR sentlich more granular, is for jointing the current conduction properties adapted table of values ​​for the data transmission rate of the corresponding compound.

Advantageous embodiments of the invention are requirements Suggested in the subclaims 2 to 7 and 9 to reproduced. 13

The present invention preferably takes place in xDSL Datenuber- transmission systems (such as ADSL or UDSL transmission systems) application in which, for example according to standard G.992.2 (G.lite respectively) of the ITU (International Telecommunication Union) Jaeim connect only four values ​​for Datenuber- transmission rate from the subscriber to the exchange and vice versa are at your disposal.

In a further embodiment of the invention, the Ta beauty is stored with the recalculated values ​​permanently until the next connection. This new table is then used as default for the next time you connect. This has the advantage that the default values ​​of a change in the conduction properties, such as aging effects, adjust.

The present invention is explained below with reference to preferred exemplary embodiments of the near reference to the attached GTEN drawings, where

Fig. 1 shows the schematic construction of a

Central office with the subscribers connected thereto, Fig. 2 shows the time course of a connection establishment from

Fig. U 3A. 3B are examples of a table with values ​​for the

Data transmission rate, and a line module with signal processor for Fig. 4

Execution of the erf dungsgemaßen process.

As is apparent from Figure 1, the switch includes (Central Office, CO) 2, inter alia, the line modules (line cards) 3a ... 3m for connecting the users or their Endgeraten Customer Premises Equipment (CPE) la ... In to the switching center 2. These line cards 3a ... 3m offer subscribers la ... In both conventional telephone services (such as POTS and ISDN) at your disposal, as well as high bit rate data services (such as ADSL, UDSL).

The subscriber la ... In this case, various Endgerate as a telephone 11a ... lln and a computer 12a ... 12n, to use the services offered at your disposal. The offers- nen services are thereby split at the subscriber la ... In a splitter 13a ... 13n to the various Endgerate 11, 12th

In the exchange 2, the services offered by the line card 3a 3m also divided .... Thus, speech data is transmitted for example in the PCM method via the voice network and the high bit rate data transmission takes place via a dedicated interface, for example, connectedness to the Internet is the (data network).

occurs, the structure of the connection between subscriber la ... In and the exchange 2, as shown in Figure 2, in several steps or phases. During the Quiet-phase there is no connection and thus no data transmission.

When a connection request of the subscriber la ... In step 21, load the table and the training phase is 23. During this training phase 23 of the maximum possible data transfer rate through the line cards 3a ... 3m line features borrowed with regard, among other things determined.

After the line characteristics have been determined, a corresponding value from the table is selected (step 22). If, for example m the training phase 23, a value of 5 s determined for the maximum possible data transfer rate of the switching center 2 to the subscriber la Mbit / s, then the prior art of the next lower table value is used for the data transfer rate, that is 4 Mbit / s is selected. In the Exchange phase of the exchange of the values ​​determined between the exchange and line card and the corresponding Endgerat done.

After connected, the actual data transmission (SHOWTIME) is carried out.

is transmission rates an example of a table of preset values ​​for the adjustable resulting data in figure 3A, in which the direction of transmission from the switching center 2 to the subscriber la ... In with Data- Downstream (DD) and the reverse transmission direction with Data Upstream (DU) is designated.

This table is in the prior art for each line, for example, depending on the cable length, set once and used at each connection as a table of default values ​​for the data transfer rate.

In this method, however, the data transfer rate achieved is usually far below the determined maximum possible data transfer rate. If, for example in the training phase, 5.5 Mbit / s were for data downstream and 150 Mbit / s determined for Data upstream data transmission rates, the actual data transfer rates according to the table in Figure 3A, 4 Mbit / s data downstream and 80 kbit / s Data- upstream.

According to the present invention, the table is recalculated after the training phase, based on the determined conductivity properties. An example of the re-computed table is shown in Figure 3B.

If the determined value for the data transmission rate too far away from the adjustable value, the table is recalculated, and the exchange phase of the step is followed back 21 (Figure 2) in which the table is loaded with the new values, and takes place a new training phase.

With the loading of a new, better suited to the current conduction properties table are now data transfer rates at your disposal, which are graded much finer.

Are now the above example, according to, 5.5 Mbit / s for data downstream and 150 kbit / s determined for Data Upstream, the set values ​​are according to Table 3B 5.4 Mbit / s and 148 kbit / s.

In a further development of the invention, the recalculated table is permanently stored until the next connection to receive a current on the respective line specially adapted table of values ​​for data transfer rates in each of the next connection, wherein this table may change after each connection.

Also, through a permanent storage and possibly recalculation when connecting the table achieved an adaptation to changing line properties, for example by aging, In addition there are disturbances or temperature effects are caused because the values ​​of the table adapted by recalculating to changing circumstances ,

In FIG. 4, the inventive device for carrying out the inventive method is shown.

The inventive device is implemented in a line module 3, wherein the signal processing is performed by a signal processor 31st

In block 32, 33, 34, the storage and availability of tables for the values ​​of the data transmission rates takes place. 32 indicates the table that the pre-set values ​​for the connection setup contains (first table), and 33 denotes the table (second table) with the values ​​provided based on the determined maximum possible data transmission rates.

The second table can be calculated by means 3Y for calculating the second table, said second table is calculated such that the calculated values having a m ö glichst slight deviation of the determined maximum possible data transfer rate.

A further possibility, the values ​​for the second table is to maintain a table of a plurality of stored tables select 34th In this case, a table is then selected from 34, which is the conduction properties obtained with the maximum possible data transfer rate to the next.

The selection is effected by the means 38 for selecting a table. In this case, for example, the second table by this means, which in this case represents a memory controller, are copied to a different memory address, so that this table in the system during the next connection is available as a first table for disposal.

Adjusting the actual data transfer rate is carried out based on the table provided by the means 36 for adjusting the data transmission rate. The setting is made based on the determined by the means 35 the maximum possible data transfer rate. the deviation between the calculated maximum data transmission rate and the data transmission rate actually emge- prepared is then determined by the means 37th

The functions of the means described may each be implemented by hardware or software solutions.

Claims

claims
1. A method for establishing a connection for the purpose of data transmission between a switching center (2) and an end gerat (12a ... 12n) of a subscriber (la ... ln) at a particular data transmission rate, comprising the steps of a) providing a first table with a certain number of preset values ​​at a time point 21, wherein each value of a particular data transfer rate speaks corresponds, b) determining the maximum possible data transfer rate during a training phase (22), and c) adjusting the data transmission rate at the end (23) of the Tra ingsphase wherein the data transfer rate is set to the next lower table value is the detected data transmission rate at the next, characterized by the following additional steps d) checking whether the deviation between the detected and the set data transmission rate exceeds a certain value, and e) on exceeding a certain deviation-providing en a second table instead of the first table and repeating steps b) to e), wherein the second table contains values ​​that have a smaller deviation from the determined data transmission rate than the values ​​of the first table.
2. The method according to claim 1, characterized in that the values ​​of the second table based on the determined data transmission rate of step b) are calculated.
3. The method according to claim 1, characterized in that the values ​​of the second table is selected from a plurality of stored tables.
4. The method according to claim 1, 2 or 3, characterized in that the values ​​of the second table are permanently stored and available for disposal during the next connection as default values.
5. The method according to any one of claims 1 to 4, characterized in that the box each have different values ​​for the data transfer rates for data transmission from the participant (la ... ln) to the exchange (2) and comprises in the reverse direction.
6. The method according to any one of claims 1 to 5, characterized in that the number of default values ​​for the data transmission rate from the subscriber (la ... ln) to the exchange (2) and vice versa is in each case equal to four.
7. A method according to any one of claims 1 to 6, characterized in that it is used in an ADSL or UDSL transmission system.
8. A device for carrying out the method according to any one of claims 1 to 7, with
Means for providing a first table (32) to a point in time (21) having a certain number of pre-set values, each value corresponding to a particular data transmission rate,
Means (35) while for determining the maximum possible data transfer rate of a training phase (22), and means (36) wherein the data transfer rate is set to the next lower table value for adjusting the data transmission rate at the end (23) of the training phase, the data transmission rate determined at next comes, characterized by
Means for checking (37) whether the deviation between the detected and the set data transmission rate exceeds a certain value, and means (38) which exceed a certain deviation, a second table (33) instead of the first table (32) providing and b) to e) repeat the process steps, wherein the second table () contains values ​​33, have data transfer rate, than the values ​​of the first table (32) the loan less deviation of the determined maximum MOG.
9. The device according to claim 8, characterized by means (39) that calculate the values ​​of the second table based on the determined maximum possible data transfer rate.
10. The device according to claim 8, characterized by
Means (34) providing a plurality of tables, which based on the determined maximum possible data transfer rate, a table is selected whose values ​​borrowed a smaller deviation of the ascertained maximum of MOG have data transfer rate, than the values ​​of the first table (32).
11. The device according to claim 8, 9 or 10, characterized by means for permanently storing and providing the second table to the next connection.
, 12. The apparatus is according to any one of claims 8 to 11, characterized in that they lunsstelle on a line module 3a ... 3m in the intermediary 2 wherein said means (35) for determining the maximum possible data transfer rate and the means (36 ) are implemented to set the data transmission rate in a line module is located on the signal processor (31).
13. A device according to any of claims 8 to 12, characterized in that it is applied in an ADSL or UDSL transmission system.
PCT/DE2000/004663 2000-01-13 2000-12-28 Method for adaptively adjusting a table of data rate options for xdsl data transmission methods, said table being adapted to lines and disturbances WO2001052464A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE10001153.5 2000-01-13
DE2000101153 DE10001153A1 (en) 2000-01-13 2000-01-13 Method of setting up data transmission link between switching centre and subscriber at given data transmission rate e.g. for ADSL-, or UDSL-, digital telephone transmission system - involves adjusting data transmission rate at end of training phase to next lower value in table drawn up with given number of pre-set values corresponding to given data transmission rates

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100481825C (en) 2001-11-08 2009-04-22 诺基亚西门子通信有限责任两合公司 Method and device for optimized XDSL data transmission
CN101120533B (en) 2005-02-15 2013-01-30 诺基亚西门子通信有限责任两合公司 Method for determining an optimal data transfer rate via a transfer medium

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8225161B2 (en) 2004-12-29 2012-07-17 Intel Corporation Retransmissions of data using increased data rate

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999048304A2 (en) * 1998-03-18 1999-09-23 Cisco Technology, Inc. Remote xdsl transceiver unit and method of operation
US5999540A (en) * 1998-12-22 1999-12-07 Cisco Technology, Inc. Rate adaptive XDSL communication system and method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999048304A2 (en) * 1998-03-18 1999-09-23 Cisco Technology, Inc. Remote xdsl transceiver unit and method of operation
US5999540A (en) * 1998-12-22 1999-12-07 Cisco Technology, Inc. Rate adaptive XDSL communication system and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100481825C (en) 2001-11-08 2009-04-22 诺基亚西门子通信有限责任两合公司 Method and device for optimized XDSL data transmission
CN101120533B (en) 2005-02-15 2013-01-30 诺基亚西门子通信有限责任两合公司 Method for determining an optimal data transfer rate via a transfer medium

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