WO1997047155A1

WO1997047155A1 - Method for transmitting data between a sending station and a receiving station assigned to it

Info

Publication number: WO1997047155A1
Application number: PCT/DE1997/000912
Authority: WO
Inventors: Michael Alger-Meunier; Kai Drebes
Original assignee: Siemens Aktiengesellschaft
Priority date: 1996-05-30
Filing date: 1997-05-05
Publication date: 1997-12-11
Also published as: JP2000514609A; CN1220814A; EP0901742A1; DE19621750A1; KR20000016209A; DE19621750C2; TW361023B

Abstract

A method for transmitting data between a sending station (1; 4) and a receiving station (2; 5) assigned to it is subscribed. The data to be transmitted are contained in data frames that are fed into the sending station sequentially, each data frame enclosing a predetermined quantity of data. The method described is characterized by the data of the frames fed into the sending station being distributed among several newly generated frames, mixed with te data of frames fed in previously or subsequently; these newly generated frames are transmitted essentially simultaneously by severyl sending devices via several transmission links (31, 32; 61, 62).

Description

description

Method for transmitting data between a transmitting station and a receiving station assigned to it

The present invention relates to a method according to the preamble of claim 1, i.e. a method for transmitting data between a transmitting station and a receiving station assigned to it, the data to be transmitted being supplied sequentially in the transmitting station, each containing data frames comprising a predetermined amount of data.

Such a method is known, for example, from the ISDN area, with the transmitting station, for example

Can be part of the so-called NT (network termination) unit and the receiving station can be part of the so-called LTdine termination) unit and / or vice versa. Between the NT unit, which is located at each of the ISDN subscribers, and the LT unit, which is located in the exchange offices or the like of the ISDN operator, one also runs as a U interface or U interface ¬ nete transmission link for the transmission of data.

The data to be transmitted by the transmitting station are contained in data frames each comprising a predetermined amount of data, which are supplied to the transmitting station.

From this, the transmitting station extracts the data to be forwarded to the receiving station and transmits them (possibly together with newly added control data) to the receiving station via the U-interface.

The problem arises here that the transmission range is limited; With the techniques and methods currently used in ISDN systems, ie with the transmitting and receiving stations currently used, data transmission method, data transmission rates and transmission route types (cable types) etc., the range is approximately 5.5 km.

If the transmitting station and the receiving station are farther than the 5.5 km apart, one or more intermediate data regenerations and amplifications are required. This can be done, for example, by so-called repeater units, which are provided along the transmission path.

The provision of such repeaters, in particular their assembly (digging, etc.) and their power supply, however, generally requires considerable effort.

The present invention is therefore based on the object of developing the method according to the preamble of claim 1 in such a way that the use of repeaters can be dispensed with in whole or in part.

According to the invention, this object is achieved by the features claimed in the characterizing part of patent claim 1.

Accordingly, it is provided that the data of the data frames supplied to the transmitting station are each mixed with the data from previously or subsequently supplied data frames and distributed over several newly generated data frames, which are essentially transmitted simultaneously by several transmitting devices over several transmission links.

The generation of several new data frames from the original data frames sequentially supplied to the transmitting station and their simultaneous transmission by several transmitting stations connected in parallel over several parallel transmission links enables a reduction in the data transmission rate on the individual transmission links. The concomitant narrowing of the transmission spectrum enables it in turn should be placed in a frequency range, the use of which for data transmission results in a comparatively low attenuation of the data to be transmitted or of the signals corresponding to them. The reduced attenuation of the data to be transmitted on the transmission link has, among other things, the positive effect that the transmission range increases.

If you split the data stream entered sequentially into the transmitter, e.g. in two data streams and transmits them at halved data transfer rates by two transmitters in parallel over two transmission links to the receiving station, so using the techniques and methods currently used in ISDN systems, the range from said 5.5 km can be approximated Increase 7 km.

A method has therefore been found by which the use of repeaters can be dispensed with in whole or in part.

The generation of new data frames each by combining the same from data from a plurality of original data frames also enables data to be treated identically or similarly in the respective data frames, as a result of which these are recognized in the receiving station or the assigned receiving device of the receiving station are easier to process and more tolerant.

Advantageous developments of the invention are the subject of the dependent claims.

The invention is explained in more detail below using exemplary embodiments with reference to the drawing. Show it FIG. 1 shows a first exemplary embodiment of a device suitable for carrying out the method according to the invention,

FIG. 2 shows a schematic representation of the content (format) of a data frame entered in a transmitting station according to FIG. 1,

FIG. 3 shows a schematic illustration to explain the generation of new data frames from data frames according to FIG. 2 entered into the transmitting station according to FIG. 1, and

FIG. 4 shows a second exemplary embodiment of a device suitable for carrying out the method according to the invention.

The transmission system shown schematically in FIG. 1 as a block diagram is part of an ISDN system and comprises a transmitting station 1, a receiving station 2 and a transmission path 3.

The transmission station 1 is part of an NT unit of the ISDN system and comprises a first transmission device 11, a second transmission device 12, a data frame conversion unit 13 and a control unit 14.

The receiving station 2 is part of an LT unit of the ISDN system and comprises a first receiving device 21, a second receiving device 22, a data frame conversion unit 23 and a control unit 24.

The transmission link 3 comprises two line pairs 31 and 32 and is the practical realization of a U-interface (U-interface) of the ISDN system connecting the NT unit and the LT unit. The range on this transmission line can be increased by using the method according to the invention. Both the transmitting devices 11 and 12 and the receiving devices 21 and 22 are designed as transmitting / receiving units (transceivers) with corresponding external circuitry, so that the transmitting devices 11 and 12 also as receiving devices and the receiving devices 21 and 22 also as transmitting devices can serve and thus enable bidirectional communication.

The transmitting devices 11 and 12 and the receiving devices 21 and 22 are each implemented in the present exemplary embodiment by the Siemens component PEB 2091 IEC-Q v4.x with corresponding external wiring.

In the present exemplary embodiment, the data frame conversion units 13 and 23 are each implemented by two Siemens components PEB 2054 EPIC-S.

The control units 14 and 24 are implemented by microprocessors, microcontrollers or the like.

The function of the transmission system shown in FIG. 1 will now be described.

The data to be transmitted via the transmission link 3 are contained in data frames which are fed to the data frame conversion unit 13 sequentially via an input connection E. These data frames are referred to as IOM-2 data frames because they are supplied to the data frame conversion unit via a so-called IOM-2 interface or an IOM-2 interface.

The definition of the IOM-2 interface or the IOM-2 interface and the IOM-2 data frames that can be transmitted via it comes from the applicant and is well known in the art. For reasons of simplicity, the IOM-2 interface (s) or IOM-2 interface (s) are referred to below as IOM interface (s) or IOM interface (s), and the IOM-2 data frames are briefly referred to as IOM data frames.

In the present exemplary embodiment, an IOM data frame is 32 bits long, which is composed of the (useful) data and control data for the transmission devices 11 and 12 to be transmitted via the transmission path 3. The content or format of such an IOM data frame is illustrated in FIG. 2. Accordingly, an IOM data frame consists of 8 bit BL data, 8 bit B2 data, 8 bit monitor data, 2 bit D data, 4 bit C / I data, 1 bit MR data and 1 bit MX data .

The useful data to be transmitted by the transmitting devices 11 and 12 together with additional control data for the receiving devices 21 and 22 are the BI, B2 and D data; the monitor, C / I, MR and MX data are control data for controlling the transmission devices 11 and 12.

The data frame conversion unit 13 has control connections via which it can be controlled by the control unit 14. The control unit 14 controls the data frame conversion unit 13 in the present exemplary embodiment in such a way that two sequentially entered IOM data frames are divided into two data frames, hereinafter referred to as IOM * data frames, each of which is connected in parallel via separate interfaces to the transmitting devices 11 and 12 are transferable and there as intended, ie how IOM data frames can be processed further. The control unit 14 also controls the data frame conversion unit 13 in such a way that it outputs said IOM * data frames over the separate (IOM *) interfaces at a respective frame transmission rate, which is only half with 4 kHz or 4000 data frames per second is as high as the frame transfer rate of the IOM data frames sequentially entered into the data frame conversion unit 13. The conversion of the sequential IOM data frames into the parallel IOM * data frames taking place in the data frame conversion unit 13 is illustrated in FIG. 3. In the example shown, two sequential IOM data frames (shown in the middle line in FIG. 3) are placed on a first IOM * data frame (shown in the lower line in FIG. 3) and one (in the top line of the Figure 3 shown) second IOM * data frame divided. Which user and control data sections of the IOM data frame are transferred to which locations within the IOM * data frame is illustrated by arrows in FIG. 3 and requires no further explanation.

In principle, the IOM data frames can be divided up into the IOM * data frames, which are preferably of equal length and have an identical or at least similar structure, largely free of narrow restrictions. However, the division illustrated in FIG. 3 deserves special attention in two respects. On the one hand, the control data (for controlling the respective transmission devices 11 and 12) of the IOM data frames are not divided up by the division, but are treated as an inseparable whole, and on the other hand the Bl data sections on the one hand and the B2 data Sections of two sequential IOM data frames, on the other hand, are concentrated in one IOM * data frame, so that the first IOM * data frame has no B2 data sections and the second IOM * data frame has no B1 data sections.

The former of the special features mentioned has the effect that the control of the respective transmission devices 11 and 12 can take place undisturbed by changes in the control data in successive IOM data frames.

The second of the special features mentioned has the effect that, during the further processing or evaluation of such data frames, not only both BI and B2 data sections, but rather either only B1 data sections or only B2 data sections. Sections must be taken into account, which under certain circumstances can considerably simplify the further processing or evaluation of such data frames and make them more tolerant of errors.

The conversion of two sequential IOM data frames into two parallel IOM * data frames enables them to be output from the data frame conversion unit 13 and processed further while maintaining the overall data transmission rate with half the data transmission rate. While 125 μs are available for the transmission of an IOM data frame (transmission of 8000 data frames per second), an IOM * data frame can, due to the parallel transmission and further processing, double the time for this, ie 250 μs for its transmission claim. The IOM * data frames can therefore be stretched in time compared to the IOM data frames (see also the time-standardized representation in FIG. 3).

The IOM * data frames output in parallel from the data frame conversion device 13 are fed to the first transmission device 11 and the second transmission device 12 via separate transmission lines. There the IOM * data frames are reformatted, provided with new control data (control data for the receiving devices 21 and 22) and as U * -

Data frame (the transmission path 3 is the so-called U interface) is output. The U * data frames are transferred to the respective transmission lines 31, 32 at a data transmission rate which is only half the size of the data transmission rate that would have to be provided if the identical amount of data in the form of undivided U- Data frames would only have to be transmitted via a single data transmission line.

Splitting the purely sequential data stream (at the input connection E of the data frame conversion device 13) into two parallel data streams (on the transmission lines 31 and 32) has the positive effect that the data transmission rate on the respective transmission lines can be halved without reducing the overall data transmission rate. The concomitant narrowing of the transmission spectrum on the respective transmission lines makes it possible to place it in a frequency range in which the transmitted or to be transmitted data or data frames experience a comparatively low attenuation, which in turn results in an increased transmission range. The distance between the transmitting station 1 and the receiving station 2 adjoining it beyond the transmission path 3 can accordingly be increased without the intermediary of repeaters. With the techniques and methods currently used in ISDN systems, this can increase the range from approximately 5.5 km to approximately 7 km. This means that a not inconsiderable number of repeaters can be saved, particularly when bridging very large distances.

The U * data frames output by the transmitting devices 11 and 12 on the transmission lines 31 and 32 are received by the receiving devices 21 and 22 of the receiving station 2, modified as IOM * data frames, and supplied to the data frame conversion device 23 (in parallel) in this is combined under control by the control unit 24 to form IOM data frames and, as such, is output sequentially via the output connection A for further processing.

A second exemplary embodiment of the present invention will now be described with reference to FIG. The method according to the invention is used in the transmission station of a repeater.

The transmission system shown schematically in FIG. 4 as a block diagram is again part of a

ISDN system and includes a first repeater 4, a second repeater 5 and a transmission link 6. The first repeater 4, which in the present exemplary embodiment has an input connection E (U interface) with a (conventional) NT unit (not shown) or a further (conventional) repeater of the ISDN transmission system shown in detail in FIG. 4 may be connected comprises a receiving station, a transmitting station and a control unit 44.

The second repeater 5, which in the present exemplary embodiment has an output connection A (U interface) with a (conventional) LT unit (not shown) or a further (conventional) repeater of the ISDN shown in detail in FIG. 4 Transmission system may be connected, also includes one

Receiving station, a transmitting station and a control unit 54; it also has a clock control unit for generating suitable clock signals for the transmitting and receiving station or the components contained therein.

The transmission link 6 comprises two line pairs 61 and 62 and is the practical implementation of a U-interface connecting the repeaters. It is the range of this ISDN-U interface that is to be increased in the present exemplary embodiment by using the method according to the invention.

The receiving station of the first repeater 4 is formed by a receiving device 41; the transmitting station of the first repeater 4 comprises a first transmitting device 42 and a second transmitting device 43.

The receiving station of the second repeater 5 is formed by a first receiving device 51 and a second receiving device 52; the transmitting station of the second repeater 5 comprises a transmitting device 53. The receiving device 41 and the transmitting devices 42 and 43 of the first repeater 4 as well as the receiving devices 51 and 52 and the transmitting device 53 of the second repeater 5 are designed as transmitting / receiving units (transceivers) with corresponding external wiring, so that the transmitting devices in each case can also serve as receiving devices and the receiving devices can also serve as transmitting devices, and bidirectional communication is therefore possible.

Both the transmitting devices and the receiving devices in the present exemplary embodiment are each implemented by the Siemens component PEB 2091 IEC-Q v5.1 with corresponding external wiring.

As in the first exemplary embodiment, the control units 44 and 54 are implemented by microprocessors, microcontrollers and the like.

The clock control unit of the second repeater 5 is designed as a PLL circuit 45 which supplies the respective transceivers of the second repeater with suitable clock signals, in part by evaluating control signals received from them.

The function of the transmission system shown in FIG. 4 will now be described.

As in the exemplary embodiment according to FIG. 1, the data to be transmitted via the transmission link 6 are contained in data frames which are fed to the receiving device 41 of the first repeater 4 via its input connection E. In contrast to the exemplary embodiment according to FIG. 1, however, these are not IOM data frames, but - since they are fed to the first repeater (from an NT unit or a further repeater) via a U interface - around different data frames, which are referred to below as U-data frames.

A U data frame comprises a predetermined number of bits which are occupied by user data (BI, B2 and D data) and control data for controlling the receiving device 41. Regarding further details, which in the present case, however, may be of minor interest, reference is made to the corresponding specifications in the ETSI and ANSI standards.

Said U data frames are thus input into the receiving device 41 of the first repeater 4 via the input connection E. The receiving device 41 has an interface via which it can be connected to the control unit 44. Not only control commands but also data frames can be exchanged between the receiving device 41 and the control unit 44 via this interface. The same applies accordingly to the use of the identical transceivers for the transmitting devices 42 and 43. This is used in the present exemplary embodiment in such a way that the U-data frames received by the receiving device 41 after their implementation in the first embodiment ¬ game known IOM data frames not via the (still existing) IOM interface to the transmitters 42 and 43 to be supplied with it, but via the special interface to the control unit 44, where it is inventively in the IOM * Data frames converted and only forwarded from here to the transmission devices, more precisely to their interfaces provided for connection to the control unit.

Said conversion of the IOM data frames in the control unit 44 takes place analogously to the conversion practiced in the data frame conversion device 13 according to FIG. 1. IOM data data sequentially output by the receiving device 41 and received by the control unit 44 There, frames are distributed to IOM * data frames which can be forwarded and processed in parallel and which are finally transmitted in parallel by the plurality of transmission devices 42 and 43 (after conversion into U * data frames) via the plurality of transmission lines 61 and 62 (U interfaces).

As in the first exemplary embodiment, splitting the purely sequential data stream (at the input terminal E of the receiving device) into two parallel data streams (on the transmission lines 61 and 62) has the positive effect that the data transmission rate on the parallel transmission lines 61 and 62 is reduced without reducing the Total data transfer rate can be halved. The concomitant narrowing of the transmission spectrum makes it possible to place it in a frequency range in which the transmitted or transmitted data or data frames experience a comparatively low attenuation, which in turn results in an increased transmission range . The distance between the first repeater 4 and the adjoining second repeater 5 or an adjoining LT unit can be increased accordingly (as in the first embodiment). In this way, a not inconsiderable number of repeaters can be saved, particularly when bridging very large distances.

In the present exemplary embodiment, the second repeater 5 shown in FIG. 4 has the task of converting the parallel data stream or U * data frame stream transmitted from the first repeater via the transmission lines 61 and 62 into a sequential data stream or U data frame stream ¬ walk.

For this purpose, the U * data frames transmitted via the transmission lines 61 and 61 are received by the receiving devices 51 and 52 of the second repeater 5, converted there into (still parallel) IOM * data frames and output to the control unit 54, there into (sequential ) IOM data frame converted and forwarded to the transmitting device 53, and finally (after conversion into sequential U-data frames as such from the output connection A for forwarding and further processing.

The data frame transmission conditions changed according to the invention require a more or less extensive adaptation of the clock signals for the respective transmitting and receiving devices both in the first exemplary embodiment and in the second exemplary embodiment. For this purpose, these devices (as partially indicated in FIGS. 1 and 4) are partially connected to control or clock signal lines, which, however, will not be discussed in more detail here.

The method according to the invention is not restricted to the conversion of two sequential IOM data frames into two IOM * data frames that can be forwarded and processed in parallel. Rather, according to the respective needs, i.e. in particular in accordance with the required extent of narrowing the transmission spectrum, any number of arbitrary data frames can be converted into any number of parallel transferable and forwardable data frames.

The invention can also be used outside of ISDN systems.

Claims

claims

1. A method for transmitting data between a transmitting station (1; 4) and a receiving station (2; 5) associated therewith, the data to be transmitted being contained in the transmitting station and being supplied sequentially, each comprising a predetermined amount of data, characterized in that that the data of the data frames supplied to the transmitting station are each mixed with the data from previously or subsequently supplied data frames and distributed over several newly generated data frames, which are essentially simultaneously transmitted by several transmitting devices over several transmission links (31, 32; 61, 62 ) be transmitted.

2. The method according to claim 1, characterized in that control data contained in a data frame to be divided (monitor, C / I, MR, MX) for controlling devices that are subsequently run through when dividing the data onto the data frames to be newly generated as an indivisible whole be treated.

3. The method according to claim 1 or 2, d a d u r c h g e k e n n z e i c h n e t that useful data (Bl, B2, D) contained in a data frame to be divided are put together in a changed composition in the distribution of the data to the data frames to be newly generated.

4. The method according to any one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t that the newly generated data frames on the respective Daten¬ transmission links (31, 32; 61, 62) are transmitted with time stretching.

5. The method according to any one of the preceding claims, characterized in that due to the reduced data transmission rates on the respective transmission links (31, 32; 61, 62) the narrowed transmission spectrum is placed in a frequency range in which data to be transmitted experience the least attenuation.

6. The method as claimed in one of the preceding claims, that the data frames to be divided into the data frames to be generated are the IOM data frames of an NT, LT or repeater unit of an ISDN system.