WO2001052465A1

WO2001052465A1 - Method for selecting existing fast retrain profiles

Info

Publication number: WO2001052465A1
Application number: PCT/DE2001/000023
Authority: WO
Inventors: Thomas Ahrndt
Original assignee: Siemens Aktiengesellschaft
Priority date: 2000-01-13
Filing date: 2001-01-05
Publication date: 2001-07-19
Also published as: DE10001152A1; DE10190106D2

Abstract

The present invention relates to a method for adapting the data transmission rate of a data transmission between a subscriber (1a 1n) and a switching centre (2) to temporarily occurring changes in the line characteristics during data transmission. The line characteristics are detected while a connection is established for data transmission and the data transmission rate is adapted to the detected line characteristics. The invention also relates to a device for carrying out said method.

Description

description

Procedure for selecting existing fast retrain profiles

The present invention relates to a method for adapting the data transmission rate of a data transmission between a subscriber and a switching center and a device for carrying out this method.

Modern exchanges in the digital electronic dialing system (EWSD) are already able to provide the subscriber with high-bit-rate data services in the xDSL (x Digital Subscriber Line) process in addition to the analog or digital telephone services in the POTS (Piain Old Telephone Service) or ISDN system To make available. A data transmission rate of up to 8 Mbit / s and up to 640 kbit / s from the subscriber to the exchange is possible in the ADSL (asymmetry digital subscriber line) process from the exchange to the subscriber.

The interface between the subscriber and the exchange or the transmission network is the line module (also line card or SLMI, Subscriber Line Module Internet), which is located in the exchange. Several subscribers (e.g. eight subscribers) with their end devices (e.g. analogue telephone and computer) are connected to a line module.

On the output side, these line modules have a PCM interface (Pulse Code Modulation) for the transmission of

Voice data into the voice network. On the output side, these line modules also have an interface (such as in the frame relay, Ethernet or ATM system) for packet-oriented data transmission in a data transmission network with high data transmission rates. L0 cυ> 0 h- ¹

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This object is achieved by a method according to the attached claim 1 and a device for carrying out this method according to the attached claim 7.

By predicting changes in line characteristics as a result of certain events, the data transfer rate according to the present invention can be automatically adapted to the changed line characteristics. The lmk down times, i.e. the times when no data transmission is possible due to the implementation of a fast retram are thus reduced.

Advantageous embodiments of the present invention are specified in subclaims 2 to 6 and 8 to 12.

The line properties change e.g. when there is an incoming telephone call from another subscriber. Due to the AC voltage (with values up to 150V peak-to-peak), which is generated during the ringing phase (Rmg-ON and Ring-OFF alternately), the line properties are influenced in such a way that the maximum possible data transfer rate drops.

According to the standards already mentioned, a new initialization phase, i.e. a fast retram is provided. However, in accordance with the present invention, this event, which results in a predictable change in line characteristics, is predictable and the data transfer rate is reduced accordingly. A data transfer rate is selected that is valid for both the Rmg-ON state and the Ring-OFF state.

This data transmission rate can now be maintained for the entire remaining duration of the data transmission, or the data transmission can be increased again automatically after the event has ended. Since the data transmission rates on a line differ in different frequency ranges, the course of the data transmission rate over the frequency range is stored in so-called profiles. According to the present inventions d _ü ng of the line characteristics is selected for data transmission, a profile thus at a predictable change which comes the corresponding conduction properties closest.

The present invention is preferably used in data transmission systems which use the xDSL method, i.e. e.g. work according to the ADSL or UDSL procedure.

The present invention is explained in more detail below on the basis of preferred exemplary embodiments with reference to the accompanying drawings, in which:

1 shows the schematic structure of a switching center with the subscribers connected to it. FIG. 2a shows the division of the frequency spectrum in ADSL data transmission. FIG. 2b shows an example of a profile for the data transmission parameters, and FIG.

As can be seen from FIG. 1, the switching center (Central Office, CO) 2 includes, among other things, the line modules 3a, ..., 3n for connecting the subscribers or their terminals (Customer Premises Equipment, CPE) la, ..., In to the exchange 2. These line modules 3a, ..., 3n provide the subscribers la, ..., In both conventional telephone services (POTS or ISDN) and high-bit-rate data services (such as ADSL, UDSL ).

The participants la, ..., In are different end devices, such as a telephone 11a, ..., lln and a computer with an xDSL modem 12a, ..., 12n for using the services offered available. The services offered are divided at the subscriber la, ..., In by a splitter 13a, ..., 13n between the respective end devices.

In the exchange 2, the services offered are divided by the line card 3a,..., 3n onto the respective transmission networks. So voice data z. B. in the PCM method over the voice network and the high-bit data transmission takes place via its own interface, the z. B. is connected to the Internet (data network).

The xDSL data transmission is described below using the frequency spectrum of the ADSL system, as shown in FIG. 2a.

The frequency band is divided as follows: The transmission of the telephone services (analog or digital) takes place in the range up to 30 kHz. The frequency range from 30 kHz to 138 kHz is used for data transmission from the subscriber to the exchange (data upstream) and the range from 138 kHz to 1.1 MHz for data transmission from the exchange to the subscriber (data downstream).

The data transmission is again divided into individual sections, the so-called Bms, over the frequency range. Each bin occupies a specific frequency range with a bandwidth of 4.3125 kHz, with each bin transmitting data in quadrature amplitude modulation (QAM) with an adjustable bit rate. The total data transfer rate results from the sum of the data transfer rates of the individual Bms.

The maximum transmission capacity of a transmission channel results, apart from the electrical parameters, from the signal / noise ratio. This means that the lower the signal-to-noise ratio, the smaller the transmission capacity. This transmission capacity ω t \) MP * P>

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As can be seen from FIG. 3, the device according to the invention for carrying out the method according to the invention is implemented on the line card 3, which is located in the switching center.

During the establishment of the connection, the line card 3 determines the line properties with regard to the maximum possible data transmission rate by measuring the transmission line between the switching center and the subscriber.

After the maximum possible data transfer rate has been determined, a corresponding profile that comes closest to the measured line properties is selected and set. A large number of possible profiles are stored in the memory device 33.

During the connection, e.g. an incoming call is registered by the means 32, the data transmission rate is automatically adapted by the means 31 to the line properties which change due to the ringing phase of the incoming call. In this case, a profile stored in the memory device 33 is selected that comes closest to the measured line properties.

Likewise, the means 32 determines the end of the specific event, i.e. H. the end of the ringing phase. The ring phase is e.g. B. then to an end when the called subscriber answers or when the calling subscriber hangs up without a conversation.

At the end of the event, the currently set profile can be retained or the previous profile can be set again.

Claims

claims

1. Method for adapting the data transmission rate of a data transmission between a subscriber la ... ln and an ^" exchange 2 to temporarily occurring changes in the line properties during the duration of the data transmission, the line properties being determined when the connection is established for data transmission and the data transmission rate being adapted to the line properties determined with an automatic adaptation of the data transmission rate to predictable changes in the line properties during the duration of the data transmission, the predictable changes in the line properties being caused by certain events.

2. The method according to claim 1, characterized in that the data transmission rate is adjusted by reducing it in the event.

3. The method according to claim 1 or 2, characterized in that the data transmission rate is adjusted by increasing it again after the end of the event.

4. The method according to claim 1, 2 or 3, characterized in that the ringing phase of an incoming call is an event in which the line properties change in a predictable manner.

5. The method according to any one of claims 1 to 4, characterized in that a preset profile with transmission parameters is used for adaptation, which is adapted to the changed line properties.

6. The method according to any one of claims 1 to 5, characterized in that it is used in the ADSL or UDSL transmission method.

7. Device for performing the method according to one of claims 1 to 6, with

Means (31) for automatically adapting the data transmission rate to predictable changes in the line properties during the duration of the data transmission, the predictable changes in the line properties being caused by certain events.

8. The device according to claim 7, characterized in that the means (31) for automatically adjusting the data transfer rate adjust the data transfer rate by reducing the data transfer rate at the event.

9. The device according to claim 7 or 8, characterized in that the means (31) for automatically adjusting the data transfer rate adjust the data transfer rate by increasing the data transfer rate again after the end of the event.

10. The device according to claim 7, 8 or 9, characterized by

Means (32) that recognize the ringing phase of an incoming call as an event that changes the line characteristics in a predictable manner.

11. Device according to one of claims 7 to 10, characterized in that the means for automatically adapting the data transmission rate for adaptation use a profile stored in a storage device (33) with transmission parameters, which is adapted to the changed line properties.

12. The device according to one of claims 7 to 11, characterized in that it is used in the ADSL or UDSL transmission method.