CA2314253A1 - Apparatus for sending and/or receiving data in an sdh or, respectively pdh transmission system - Google Patents
Apparatus for sending and/or receiving data in an sdh or, respectively pdh transmission system Download PDFInfo
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- CA2314253A1 CA2314253A1 CA002314253A CA2314253A CA2314253A1 CA 2314253 A1 CA2314253 A1 CA 2314253A1 CA 002314253 A CA002314253 A CA 002314253A CA 2314253 A CA2314253 A CA 2314253A CA 2314253 A1 CA2314253 A1 CA 2314253A1
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 129
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000010586 diagram Methods 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 230000001419 dependent effect Effects 0.000 description 4
- 230000003068 static effect Effects 0.000 description 3
- 230000001629 suppression Effects 0.000 description 2
- 101710139363 Mini-ribonuclease 3 Proteins 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
- H04J3/1605—Fixed allocated frame structures
- H04J3/1611—Synchronous digital hierarchy [SDH] or SONET
- H04J3/1617—Synchronous digital hierarchy [SDH] or SONET carrying packets or ATM cells
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
- H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
- H04Q11/0478—Provisions for broadband connections
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
- H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
- H04J2203/0089—Multiplexing, e.g. coding, scrambling, SONET
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- 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
- H04L2012/5638—Services, e.g. multimedia, GOS, QOS
- H04L2012/5646—Cell characteristics, e.g. loss, delay, jitter, sequence integrity
- H04L2012/5652—Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly
- H04L2012/5653—Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly using the ATM adaptation layer [AAL]
- H04L2012/5656—Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly using the ATM adaptation layer [AAL] using the AAL2
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- 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
- H04L2012/5672—Multiplexing, e.g. coding, scrambling
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
Disclosed is a device for transmitting data in an SDH or a PDH transmission system, comprising a device (2) for arranging data coming in through several data channels in flexible length minicells (7) and a device (3) for generating a single data on the basis of said the minicells (7). The inventive device is characterized by a device (6) that directly generates transmission for the SDH
or the PDH transmission system on the basis of the data flow. The invention also includes a method for sending data in an SDH or a PDH transmission system, comprising the following steps: arranging the data coming in through several data channels in flexible length minicells; generating a single data flow on the basis of the minicells and directly generating transmission frames for the SDH or PDH transmission system on the basis of the data flow. The present invention further comprises a corresponding device and a corresponding method for receiving such data in an SDH or PDH transmission system. The invention enables the use of existing and pending AAL2 standards by avoiding transmission band width losses associated with the use of ATM cells.
or the PDH transmission system on the basis of the data flow. The invention also includes a method for sending data in an SDH or a PDH transmission system, comprising the following steps: arranging the data coming in through several data channels in flexible length minicells; generating a single data flow on the basis of the minicells and directly generating transmission frames for the SDH or PDH transmission system on the basis of the data flow. The present invention further comprises a corresponding device and a corresponding method for receiving such data in an SDH or PDH transmission system. The invention enables the use of existing and pending AAL2 standards by avoiding transmission band width losses associated with the use of ATM cells.
Description
APPARATUS FOR SENDING AND/OR RECEIVING DATA IN AN SDH OR, RESPECTIVELY, PDH TRANSMISSION SYSTEM
The present invention is directed to an apparatus and a method for sending and/or receiving data such as, for example, compressed voice data in an SDH
or, respectively, PDH transmission system.
In the transmission of data such as, for example, compressed voice data in SDH or, respectively, PDH transmission systems (SDH: synchronous digital hierarchy, PDH: plesiochronic digital hierarchy), data incoming on a plurality of different voice channels are combined in time-division multiplex and transmitted via a single channel such as, for example, a 64 kbit/s channel. An occupancy of the transmission path that is higher by the compression factor thus derives. Up to now, static multiplexing methods were employed for the combining of the channels such as, for example, in mobile radiotelephony. The pre-condition therefor is that all data incoming on the various voice channels are compressed to the same rate and that this rate does not change during operation. The data on the various data channels arrive regularly and are statically multiplexed, i. e. according to a specific, fixed strategy.
This has the disadvantage that a flexible transmission of different data rates is not possible for the individual voice channels. In static multiplexing, further, no reduction of the channel width is possible on the basis of speech pause suppression.
The present invention is directed to an apparatus and a method for sending and/or receiving data such as, for example, compressed voice data in an SDH
or, respectively, PDH transmission system.
In the transmission of data such as, for example, compressed voice data in SDH or, respectively, PDH transmission systems (SDH: synchronous digital hierarchy, PDH: plesiochronic digital hierarchy), data incoming on a plurality of different voice channels are combined in time-division multiplex and transmitted via a single channel such as, for example, a 64 kbit/s channel. An occupancy of the transmission path that is higher by the compression factor thus derives. Up to now, static multiplexing methods were employed for the combining of the channels such as, for example, in mobile radiotelephony. The pre-condition therefor is that all data incoming on the various voice channels are compressed to the same rate and that this rate does not change during operation. The data on the various data channels arrive regularly and are statically multiplexed, i. e. according to a specific, fixed strategy.
This has the disadvantage that a flexible transmission of different data rates is not possible for the individual voice channels. In static multiplexing, further, no reduction of the channel width is possible on the basis of speech pause suppression.
2 0 The ATM adaptation layer 2 (AAL 2) was defined in the standard ITU-T
L363.2 for the common transmission of a plurality of voice channels via ATM
transmission networks (ATM: asynchronous transfer mode). The AAL2 specification describes a cell-oriented, two-stage method that is explained with reference to Figures 4 and 5. In the first stage, voice data supplied on a plurality of voice channels 1 a, 1 b, 2 5 ... 1 n are arranged in mini-cells 7 of flexible length in a means 2. Such mini-cells 7a, 7b, .. 7n are shown by way of example in Figure 5. Each mini-cell comprises a mini-cell header 8a, 8b, ... 8n at its beginning. The part of the mini-cells 7a, 7b, ... 7n following the respective mini-cell header contains the respective voice data 9a, 9b, ..
9n of the respective voice channel 1 a, 1 b, ... 1 n.
Substitute Page The mini-cells 7a, 7b, ... 7n are combined into a single data stream in a means 3, i.e. arranged following one another, as shown in Figure 5. The means 3 thus implements a static multiplexing of the mini-cells 7a, 7b, ... 7n in order to merge them to form a single data or, respectively, mini-cell stream.
In the second stage of the method described in the AAL2 specification, the data stream is subsequently packed in ATM data packets in a means 4. In other words, data packets that correspond to the asynchronous transfer mode are generated from the data stream in the means 4. An ATM header 10 as well as a start field 11 are thereby attached to each ATM data packer at its start. The start field 11 contains an offset field 12 as well as a sequence number 13 and a parity bit 14. The offset field 12 thereby contains information about the position of the respective mini-cells 7 in the ATM data packet. The following ATM data packet similarly contains an ATM
header 15, a start field 16 and a mini-cell 7n. The space that is not required in this ATM data packet is filled with stuffing data 17.
In a means 5, the ATM data packets are converted into frame structures, i.e. into transmission frames, that correspond to the SDH or, respectively, PDH
transmission system in which the data are to be transmitted. The transmission can thereby ensue, for example, via radio or via fixed lines. The transmitted SDH
or, respectively, PDH transmission frames are received by a reception means that 2 0 comprises the corresponding, inverse devices as the transmission means shown in Figure 4. The disadvantage of this method described in the AAL2 specification is that the voice data must first be inserted into ATM data packets before they can be transmitted in the SDH or, respectively, PDH transmission system, as a result whereof the available or, respectivEly, possible transmission bandwidth is reduced.
2 5 The document by Johnsson, M. et al., "SUPPORT FOR LOW BITRATE
APPLICATIONS IN ATM NETWORKS", PROCEEDINGS OF IPIP WORKSHOP
ON PERFORMANCE MODELLING AND EVALUATION OF ATM NETWORKS, 3 June 1996, pages 39/1 through 39/14, XP002045906, is concerned with the problem of low bitrate data transmission (for example, of voice data) via an ATM
network.
3 0 The data are thereby likewise arranged in mini-~°lls. The mini-cells are in turn multiplexed into an ATM cell flow and sent via the ATM network.
Substitute Page 2a It is thus the object of the present invention is thus to offer an apparatus for sending data in an SDH or, respectively, PDH transmission system according to the preamble of the attached claim 1, a method for sending data in an SDH or, respectively, PDH transmission system according to the attached claim 6, an apparatus for receiving data in an SDH or, respectively, PDH transmission system according to the preamble of the attached claim 10 and a method for receiving data according to the attached claim 15 that enable an increased transmission bandwidth in the transmission of data, for example compressed voice data.
This object is achieved by an apparatus and a method for sending data in an SDH or, respectively, PDH transmission system comprising the features of the attached claim 1 or, respectively, the features of the attached claim 6. The object is also achieved by an apparatus and a method for the reception of data in an SDH
transmission system comprising the features of the attached claim 10 or, respectively, of the attached claim 15.
The apparatus and the method for sending data in an SDH or, respectively, PDH transmission system according to the present invention are particularly characterized in that the single data stream composed of the mini-cells is imaged into the frame structure of the SDH or, respectively, PDH transmission system in a direct way instead of or, respectively, as an alternative to the generation of data packets (ATM data packets) corresponding to the asynchronous transfer mode.
Given the apparatus or, respectively, given the method for receiving data in an SDH or, respectively, PDH transmission system according to the present invention, correspondingly, a data stream from which the mini-cells are in turn restored is generated in a direct way from the incoming transmission frame corresponding to the SDH or, respectively, PDH transmission system instead of or, respectively, as an 2 0 alternative to the generation of ATM data packets.
The present invention thereby allows a significantly better usage of the transmission bandwidth in SDH or, respectively, PDH transmission systems, for example in the transmission of compressed voice data. Further, the present invention also allows the employment of dif~'erent compression rates and compression methods 2 5 within a multiplex bundle and, in particular, the use of a speech pause suppression wherein the transmission capacities that are not needed during speech pauses are filled up with the voice data of other channels, for example by statistical multiplexing.
Advantageous developments of the present invention are defined in the respective subclaims.
L363.2 for the common transmission of a plurality of voice channels via ATM
transmission networks (ATM: asynchronous transfer mode). The AAL2 specification describes a cell-oriented, two-stage method that is explained with reference to Figures 4 and 5. In the first stage, voice data supplied on a plurality of voice channels 1 a, 1 b, 2 5 ... 1 n are arranged in mini-cells 7 of flexible length in a means 2. Such mini-cells 7a, 7b, .. 7n are shown by way of example in Figure 5. Each mini-cell comprises a mini-cell header 8a, 8b, ... 8n at its beginning. The part of the mini-cells 7a, 7b, ... 7n following the respective mini-cell header contains the respective voice data 9a, 9b, ..
9n of the respective voice channel 1 a, 1 b, ... 1 n.
Substitute Page The mini-cells 7a, 7b, ... 7n are combined into a single data stream in a means 3, i.e. arranged following one another, as shown in Figure 5. The means 3 thus implements a static multiplexing of the mini-cells 7a, 7b, ... 7n in order to merge them to form a single data or, respectively, mini-cell stream.
In the second stage of the method described in the AAL2 specification, the data stream is subsequently packed in ATM data packets in a means 4. In other words, data packets that correspond to the asynchronous transfer mode are generated from the data stream in the means 4. An ATM header 10 as well as a start field 11 are thereby attached to each ATM data packer at its start. The start field 11 contains an offset field 12 as well as a sequence number 13 and a parity bit 14. The offset field 12 thereby contains information about the position of the respective mini-cells 7 in the ATM data packet. The following ATM data packet similarly contains an ATM
header 15, a start field 16 and a mini-cell 7n. The space that is not required in this ATM data packet is filled with stuffing data 17.
In a means 5, the ATM data packets are converted into frame structures, i.e. into transmission frames, that correspond to the SDH or, respectively, PDH
transmission system in which the data are to be transmitted. The transmission can thereby ensue, for example, via radio or via fixed lines. The transmitted SDH
or, respectively, PDH transmission frames are received by a reception means that 2 0 comprises the corresponding, inverse devices as the transmission means shown in Figure 4. The disadvantage of this method described in the AAL2 specification is that the voice data must first be inserted into ATM data packets before they can be transmitted in the SDH or, respectively, PDH transmission system, as a result whereof the available or, respectivEly, possible transmission bandwidth is reduced.
2 5 The document by Johnsson, M. et al., "SUPPORT FOR LOW BITRATE
APPLICATIONS IN ATM NETWORKS", PROCEEDINGS OF IPIP WORKSHOP
ON PERFORMANCE MODELLING AND EVALUATION OF ATM NETWORKS, 3 June 1996, pages 39/1 through 39/14, XP002045906, is concerned with the problem of low bitrate data transmission (for example, of voice data) via an ATM
network.
3 0 The data are thereby likewise arranged in mini-~°lls. The mini-cells are in turn multiplexed into an ATM cell flow and sent via the ATM network.
Substitute Page 2a It is thus the object of the present invention is thus to offer an apparatus for sending data in an SDH or, respectively, PDH transmission system according to the preamble of the attached claim 1, a method for sending data in an SDH or, respectively, PDH transmission system according to the attached claim 6, an apparatus for receiving data in an SDH or, respectively, PDH transmission system according to the preamble of the attached claim 10 and a method for receiving data according to the attached claim 15 that enable an increased transmission bandwidth in the transmission of data, for example compressed voice data.
This object is achieved by an apparatus and a method for sending data in an SDH or, respectively, PDH transmission system comprising the features of the attached claim 1 or, respectively, the features of the attached claim 6. The object is also achieved by an apparatus and a method for the reception of data in an SDH
transmission system comprising the features of the attached claim 10 or, respectively, of the attached claim 15.
The apparatus and the method for sending data in an SDH or, respectively, PDH transmission system according to the present invention are particularly characterized in that the single data stream composed of the mini-cells is imaged into the frame structure of the SDH or, respectively, PDH transmission system in a direct way instead of or, respectively, as an alternative to the generation of data packets (ATM data packets) corresponding to the asynchronous transfer mode.
Given the apparatus or, respectively, given the method for receiving data in an SDH or, respectively, PDH transmission system according to the present invention, correspondingly, a data stream from which the mini-cells are in turn restored is generated in a direct way from the incoming transmission frame corresponding to the SDH or, respectively, PDH transmission system instead of or, respectively, as an 2 0 alternative to the generation of ATM data packets.
The present invention thereby allows a significantly better usage of the transmission bandwidth in SDH or, respectively, PDH transmission systems, for example in the transmission of compressed voice data. Further, the present invention also allows the employment of dif~'erent compression rates and compression methods 2 5 within a multiplex bundle and, in particular, the use of a speech pause suppression wherein the transmission capacities that are not needed during speech pauses are filled up with the voice data of other channels, for example by statistical multiplexing.
Advantageous developments of the present invention are defined in the respective subclaims.
Given the apparatus or, respectively, the method for sending data according to the present invention, position information with respect to the position of the first mini-cell in the transmission frame are thereby advantageously generated for each transmission frame generated directly from the data stream. These position data are thereby advantageously arranged at the beginning of the respective SDH or, respectively, PDH transmission frame. It is also advantageous when a statistical time-division multiplexing of the data incoming in the plurality of data channels is implemented upon generation of the data stream in the apparatus or, respectively, the method for sending data. The statistical time-division multiplexing makes its possible to multiplex data incoming with different compression rates on the various voice channels and produce a single data stream. When the inventive apparatus for sending data should also be capable of transmitting data corresponding to the AAL2 specification, then a means for generating ATM data packets from the data stream and a means for generating transmission frames corresponding to the SDH or, respectively, PDH transmission system from the ATM data packets are to be provided. In this case, the inventive apparatus can transmit data corresponding to the AAL2 standard and corresponding to the present invention either in parallel fashion or alternatively. In particular, the present invention thereby also assures the compatibility of the apparatus or, respectively, of the method for sending or, respectively, receiving data with the 2 0 AAL2 specification and/or with higher layers of standards yet to be defined. The present invention thus allows thus utilization of existing AAL2 standards and of AAL2 standards yet to be defined while avoiding the loss of transmission bandwidth connected with the use of ATM cells.
In the apparatus or, respectively, the method for receiving data according 2 5 to the present invention, the data stream is advantageously generated on the basis of position data with respect to the position of the first mini-cell in the transmission frame that are contained in every SDH or, respectively, PDH transmission frame.
Advantageously, the position data are thereby arranged at the beginning of the respective transmission frame. The distribution of the data contained in mini-cells in 3 0 the data stream is implemented by demultiplexing the data stream according to the information contained in the mini-cell header. So that the inventive apparatus for receiving data can also be employed in a transmission system that is based on the AAL2 specification, a means for recovering data packets corresponding tothe ATM
transmission mode from the SDH or, respectively, PDH transmission frames and a 5 means for generating the data stream from the ATM data packets are also to be advantageously provided. The reception of the data according to the AAL2 specification can thereby ensue parallel or alternatively to the inventive data reception.
The present invention is also directed to a system for the transmission of data in an SDH or, respectively, PDH transmission system that comprises an apparatus for sending data and an apparatus for receiving data according to the present invention.
The present invention is explained in greater detail below on the basis of preferred exemplary embodiments with reference to the attached drawings, which show:
Figure 1 a block diagram of an apparatus for sending data in an SDH or, respectively, PDH transmission system according to the present invention;
Figure 2 a schematic illustration of the inventively generated mini-cells and transmission frames when sending data;
Figure 3 a block diagram of an apparatus for receiving data in an SDH or, 2 0 respectively, PDH transmission system according to the present invention;
Figure 4 a block circuit diagram of an apparatus for sending data in an SDH
or, respectively, PDH transmission system according to the AAL2 specification; and Figure 5 a schematic illustration of mini-cells and ATM cells generated according to 2 5 the AAL2 specification.
Figure 1 shows a block circuit diagram of an exemplary embodiment of an apparatus for sending data in an SDH or, respectively, PDH transmission system according to the present invention. Voice data supplied in a plurality of different voice channels 1 a, 1 b, . .. 1 n are arranged in mini-cells 7a, 7b, ... 7n in a means 2. The mini-3 0 cells 7a, 7b, ... 7n have flexible lengths dependent on the respective voice dataset, as schematically shown in Figure 2. The start of each mini-cell 7a, 7b, ... 7n is formed by a mini-cell header 8a, 8b, ... 8n that is followed by the respective voice data 9a, 9b, ...
9n of corresponding length.
The mini-cells 7a, 7b, ... 7n are combined into a single data stream in a statistical multiplexer 3, whereby the mini-cells that are formed are joined to one another dependent on their chronological arrival, as shown in Figure 2.
The transmission means shown in Figure 1 also comprises a transmission branch according to the AAL2 specification, wherein a means 4 generates ATM
data packets or, respectively, data packets corresponding to the asynchronous transfer mode from the data stream, transmission frames that correspond to the SDH or, respectively, PDH transmission system being in turn formed therefrom in a means 5.
Independently thereof or as an alternative thereto, transmission frames that correspond to the SDH or, respectively, PDH transmission system are inventively generated from the data stream in a direct way in a means 6, dependent on the application. The direct generation of a PDH frame 18 from the data stream is shown by way of example in Figure 2. The means 6 thereby inserts a start field 20 that contains an offset field 21, a sequence number 22 and a parity bit 23 at the beginning of the PDH transmission frame 18, i. e. following the frame start 19. The offset field 21 contains data that identify the position of the first mini-cell 7a in the PDH frame 18.
2 0 The start field 20 of the PDH frame 18 thereby essentially corresponds to the staxt field of the ATM data packets that is schematically shown in Figure 5. Stuffing data are provided at the end of the PDH frame 18 in order to fill up the space that is not needed.
Figure 3 shows a block circuit diagram of an exemplary embodiment of an 2 5 apparatus for the reception of data in an SDH or, respectively, PDH
transmission system according to the present invention. The reception means is likewise designed for alternative or parallel operation in a transmission system corresponding to the AAL2 specification, and its AAL2 reception branch comprises a means 25 at which transmission frames that correspond to the SDIT or, respectively, PDH
transmission 3 0 system arrive. These data can be transmitted, for example, either via mobile radiotelephone or via fixed lines. The means 25 generates data packets corresponding to the ATM or, respectively, the asynchronous transfer mode from the frames corresponding to the SDH or, respectively, PDH transmission system. A means 26 generates a data stream composed of mini-cells from the ATM cells. A
demultiplexer 28 distributes the mini-cells contained in the data stream onto the respective voice channels 30a, 30b ... 30n, and a means 29 generates to corresponding voice signals from the information in the mini-cells. The means 25, 26, 28 and 29 thus meet the AAL2 specification.
Inventively, a means 27 is provided wherein the incoming transmission frames that correspond to the SDH or, respectively, PDH transmission system are directly converted into a data stream. Dependent on the requirements, thus, the means 27 works independently of, alternatively to or parallel to the means 25 and 26. Similar to the data stream regenerated in the means 26, the data stream directly generated in the means 27 is supplied to the demultiplexer 28.
The present invention further comprises a transmission system that contains an apparatus for sending data according to the exemplary embodiment shown in Figure 1 as well as a means for receiving data according to the exemplary embodiment shown in Figure 3. The SDH or, respectively, PDH transmission system, in accord wherewith the data are transmitted, can thereby be a mobile radiotelephone system, a system with 2 0 fixed lines, etc.
In the apparatus or, respectively, the method for receiving data according 2 5 to the present invention, the data stream is advantageously generated on the basis of position data with respect to the position of the first mini-cell in the transmission frame that are contained in every SDH or, respectively, PDH transmission frame.
Advantageously, the position data are thereby arranged at the beginning of the respective transmission frame. The distribution of the data contained in mini-cells in 3 0 the data stream is implemented by demultiplexing the data stream according to the information contained in the mini-cell header. So that the inventive apparatus for receiving data can also be employed in a transmission system that is based on the AAL2 specification, a means for recovering data packets corresponding tothe ATM
transmission mode from the SDH or, respectively, PDH transmission frames and a 5 means for generating the data stream from the ATM data packets are also to be advantageously provided. The reception of the data according to the AAL2 specification can thereby ensue parallel or alternatively to the inventive data reception.
The present invention is also directed to a system for the transmission of data in an SDH or, respectively, PDH transmission system that comprises an apparatus for sending data and an apparatus for receiving data according to the present invention.
The present invention is explained in greater detail below on the basis of preferred exemplary embodiments with reference to the attached drawings, which show:
Figure 1 a block diagram of an apparatus for sending data in an SDH or, respectively, PDH transmission system according to the present invention;
Figure 2 a schematic illustration of the inventively generated mini-cells and transmission frames when sending data;
Figure 3 a block diagram of an apparatus for receiving data in an SDH or, 2 0 respectively, PDH transmission system according to the present invention;
Figure 4 a block circuit diagram of an apparatus for sending data in an SDH
or, respectively, PDH transmission system according to the AAL2 specification; and Figure 5 a schematic illustration of mini-cells and ATM cells generated according to 2 5 the AAL2 specification.
Figure 1 shows a block circuit diagram of an exemplary embodiment of an apparatus for sending data in an SDH or, respectively, PDH transmission system according to the present invention. Voice data supplied in a plurality of different voice channels 1 a, 1 b, . .. 1 n are arranged in mini-cells 7a, 7b, ... 7n in a means 2. The mini-3 0 cells 7a, 7b, ... 7n have flexible lengths dependent on the respective voice dataset, as schematically shown in Figure 2. The start of each mini-cell 7a, 7b, ... 7n is formed by a mini-cell header 8a, 8b, ... 8n that is followed by the respective voice data 9a, 9b, ...
9n of corresponding length.
The mini-cells 7a, 7b, ... 7n are combined into a single data stream in a statistical multiplexer 3, whereby the mini-cells that are formed are joined to one another dependent on their chronological arrival, as shown in Figure 2.
The transmission means shown in Figure 1 also comprises a transmission branch according to the AAL2 specification, wherein a means 4 generates ATM
data packets or, respectively, data packets corresponding to the asynchronous transfer mode from the data stream, transmission frames that correspond to the SDH or, respectively, PDH transmission system being in turn formed therefrom in a means 5.
Independently thereof or as an alternative thereto, transmission frames that correspond to the SDH or, respectively, PDH transmission system are inventively generated from the data stream in a direct way in a means 6, dependent on the application. The direct generation of a PDH frame 18 from the data stream is shown by way of example in Figure 2. The means 6 thereby inserts a start field 20 that contains an offset field 21, a sequence number 22 and a parity bit 23 at the beginning of the PDH transmission frame 18, i. e. following the frame start 19. The offset field 21 contains data that identify the position of the first mini-cell 7a in the PDH frame 18.
2 0 The start field 20 of the PDH frame 18 thereby essentially corresponds to the staxt field of the ATM data packets that is schematically shown in Figure 5. Stuffing data are provided at the end of the PDH frame 18 in order to fill up the space that is not needed.
Figure 3 shows a block circuit diagram of an exemplary embodiment of an 2 5 apparatus for the reception of data in an SDH or, respectively, PDH
transmission system according to the present invention. The reception means is likewise designed for alternative or parallel operation in a transmission system corresponding to the AAL2 specification, and its AAL2 reception branch comprises a means 25 at which transmission frames that correspond to the SDIT or, respectively, PDH
transmission 3 0 system arrive. These data can be transmitted, for example, either via mobile radiotelephone or via fixed lines. The means 25 generates data packets corresponding to the ATM or, respectively, the asynchronous transfer mode from the frames corresponding to the SDH or, respectively, PDH transmission system. A means 26 generates a data stream composed of mini-cells from the ATM cells. A
demultiplexer 28 distributes the mini-cells contained in the data stream onto the respective voice channels 30a, 30b ... 30n, and a means 29 generates to corresponding voice signals from the information in the mini-cells. The means 25, 26, 28 and 29 thus meet the AAL2 specification.
Inventively, a means 27 is provided wherein the incoming transmission frames that correspond to the SDH or, respectively, PDH transmission system are directly converted into a data stream. Dependent on the requirements, thus, the means 27 works independently of, alternatively to or parallel to the means 25 and 26. Similar to the data stream regenerated in the means 26, the data stream directly generated in the means 27 is supplied to the demultiplexer 28.
The present invention further comprises a transmission system that contains an apparatus for sending data according to the exemplary embodiment shown in Figure 1 as well as a means for receiving data according to the exemplary embodiment shown in Figure 3. The SDH or, respectively, PDH transmission system, in accord wherewith the data are transmitted, can thereby be a mobile radiotelephone system, a system with 2 0 fixed lines, etc.
Claims (18)
1. Apparatus for sending data in an SDH or, respectively, PDH
transmission system, comprising a means (2) for receiving and arranging data incoming in a plurality of data channels (1) in mini-cells of flexible length, a means (3) for generating a single data stream from the mini-cells, whereby the received mini-cells are joined to one another in the data stream, characterized by a means (6) for the direct generation of transmission frames from the data stream and for sending the generated transmission frames via an SDH or, respectively, PDH
transmission system, whereby the individual transmission frames contain a plurality of mini-cells and correspond to the frame structure of the SDH or, respectively, PDH
transmission system.
transmission system, comprising a means (2) for receiving and arranging data incoming in a plurality of data channels (1) in mini-cells of flexible length, a means (3) for generating a single data stream from the mini-cells, whereby the received mini-cells are joined to one another in the data stream, characterized by a means (6) for the direct generation of transmission frames from the data stream and for sending the generated transmission frames via an SDH or, respectively, PDH
transmission system, whereby the individual transmission frames contain a plurality of mini-cells and correspond to the frame structure of the SDH or, respectively, PDH
transmission system.
2. Apparatus for sending data in an SDH or, respectively, PDH
transmission system according to claim 1, characterized by a means (4) for generating data packets corresponding to an asynchronous transfer mode from the data stream, and a means (5) for generating transmission frames corresponding to the SDH or, respectively, PDH transmission system from the data packets corresponding to the asynchronous transfer mode.
transmission system according to claim 1, characterized by a means (4) for generating data packets corresponding to an asynchronous transfer mode from the data stream, and a means (5) for generating transmission frames corresponding to the SDH or, respectively, PDH transmission system from the data packets corresponding to the asynchronous transfer mode.
3. Apparatus for sending data in an SDH or, respectively, PDH
transmission system according to claim 1 or 2, characterized in that the means (6) for the direct generation of transmission frames generate position data (20) with respect to the position of the first mini-cell in the transmission frame in each transmission frame.
transmission system according to claim 1 or 2, characterized in that the means (6) for the direct generation of transmission frames generate position data (20) with respect to the position of the first mini-cell in the transmission frame in each transmission frame.
4. Apparatus for sending data in an SDH or, respectively, PDH
transmission system according to claim 3 characterized in that the means (6) for the direct generation of transmission frames from the data stream arranges the position data (20) at the beginning of a respective transmission frame.
transmission system according to claim 3 characterized in that the means (6) for the direct generation of transmission frames from the data stream arranges the position data (20) at the beginning of a respective transmission frame.
5. Apparatus for sending data in an SDH or, respectively, PDH
transmission system according to one of the preceding claims, characterized in that the means (3) for generating a single data stream is a means for the statistical time-division multiplexing of the data incoming in the plurality of data channels (1).
transmission system according to one of the preceding claims, characterized in that the means (3) for generating a single data stream is a means for the statistical time-division multiplexing of the data incoming in the plurality of data channels (1).
6. Method for sending data in an SDH or, respectively, PDH transmission system, comprising the following steps:
receiving and arranging data incoming in a plurality of data channels in mini-cells of flexible length, whereby the received mini-cells are arranged following one another in the data stream, generating a single data stream from the mini-cells, and direct generation of transmission frames from the data stream and sending the generated transmission frames via an SDH or, respectively, PDH transmission system, whereby the individual transmission frames contain a plurality of mini-cells and correspond to the frame structure of the SDH or, respectively, PDH transmission system.
receiving and arranging data incoming in a plurality of data channels in mini-cells of flexible length, whereby the received mini-cells are arranged following one another in the data stream, generating a single data stream from the mini-cells, and direct generation of transmission frames from the data stream and sending the generated transmission frames via an SDH or, respectively, PDH transmission system, whereby the individual transmission frames contain a plurality of mini-cells and correspond to the frame structure of the SDH or, respectively, PDH transmission system.
7. Method for sending data in an SDH or, respectively, PDH transmission system according to claim 6, characterized in that position data with respect to the position of the first mini-cell in the transmission frame are generated in the direct generation of transmission frames corresponding to the SDH or, respectively, PDH transmission system.
8. Method for sending data in an SDH or, respectively, PDH transmission system according to claim 6, characterized in that the position data are arranged at the beginning of a respective transmission frame.
9. Method for sending data in an SDH or, respectively, PDH transmission system according to one of the claims 6 through 8, characterized in that a statistical time-division multiplexing of the data incoming in the plurality of data channels is implemented when generating the data stream.
10. Apparatus for receiving data in an SDH or, respectively, PDH
transmission system, comprising a means (27) for the reception and the direct generation of a single data stream of mini-cells from incoming transmission frames corresponding to the frame structure of the SDH or, respectively, PDH transmission system, a means (28) for the distribution of data contained in mini-cells in the data stream onto respective data channels, and a means (29) for the restoration of the data of the individual data channels (30) from the mini-cells.
transmission system, comprising a means (27) for the reception and the direct generation of a single data stream of mini-cells from incoming transmission frames corresponding to the frame structure of the SDH or, respectively, PDH transmission system, a means (28) for the distribution of data contained in mini-cells in the data stream onto respective data channels, and a means (29) for the restoration of the data of the individual data channels (30) from the mini-cells.
11. Apparatus for receiving data in an SDH or, respectively, PDH
transmission system, characterized by a means (25) for recovering data packets corresponding to an asynchronous transfer mode from the incoming transmission frames corresponding to the SDH or, respectively, PDH transmission system, and a means (26) for generating the data stream from the data packets corresponding to the asynchronous transfer mode.
transmission system, characterized by a means (25) for recovering data packets corresponding to an asynchronous transfer mode from the incoming transmission frames corresponding to the SDH or, respectively, PDH transmission system, and a means (26) for generating the data stream from the data packets corresponding to the asynchronous transfer mode.
12. Apparatus for receiving data in an SDH or, respectively, PDH
transmission system according to claim 10 or 11, characterized in that the means (27) for the reception and the direct generation of the data stream from the incoming transmission frames corresponding to the SDH or, respectively, PDH
transmission system generates the data stream on the basis of position data (20) with respect to the position of the first mini-cell in the transmission frame that are contained in every transmission frame.
transmission system according to claim 10 or 11, characterized in that the means (27) for the reception and the direct generation of the data stream from the incoming transmission frames corresponding to the SDH or, respectively, PDH
transmission system generates the data stream on the basis of position data (20) with respect to the position of the first mini-cell in the transmission frame that are contained in every transmission frame.
13. Apparatus for receiving data in an SDH or, respectively, PDH
transmission system according to claim 12, characterized in that the position data (20) are arranged at the beginning of a respective transmission frame.
transmission system according to claim 12, characterized in that the position data (20) are arranged at the beginning of a respective transmission frame.
14. Apparatus for receiving data in an SDH or, respectively, PDH
transmission system according to one of the claims 10 through 13, characterized in that the means (28) for distributing the data is a means for demultiplexing the data stream according to the information contained in the mini-cell header.
transmission system according to one of the claims 10 through 13, characterized in that the means (28) for distributing the data is a means for demultiplexing the data stream according to the information contained in the mini-cell header.
15. Method for receiving data in an SDH or, respectively, PDH
transmission system, comprising the following steps:
reception and direct generation of a single data stream from the incoming transmission frames corresponding to the frame structure of the SDH or, respectively, PDH transmission system, distribution of data contained in mini-cells in the data stream onto respective data channels, and restoration of the data of the individual data channels from the mini-cells.
transmission system, comprising the following steps:
reception and direct generation of a single data stream from the incoming transmission frames corresponding to the frame structure of the SDH or, respectively, PDH transmission system, distribution of data contained in mini-cells in the data stream onto respective data channels, and restoration of the data of the individual data channels from the mini-cells.
16. Method for receiving data in an SDH or, respectively, PDH
transmission system according to claim 15, characterized in that the data stream is generated on the basis of position data with respect to the position of the first mini-cell in the transmission frame that are contained in every transmission frame.
transmission system according to claim 15, characterized in that the data stream is generated on the basis of position data with respect to the position of the first mini-cell in the transmission frame that are contained in every transmission frame.
17. Method for receiving data in an SDH or, respectively, PDH
transmission system according to claim 16, characterized in that the position data are arranged at the beginning of a respective transmission frame.
transmission system according to claim 16, characterized in that the position data are arranged at the beginning of a respective transmission frame.
18. Method for receiving data in an SDH or, respectively, PDH
transmission system according to one of the claims 15 through 17, characterized in that a demultiplexing of the data stream corresponding to the information contained in the mini-cell header is implemented in the distribution of the data.
transmission system according to one of the claims 15 through 17, characterized in that a demultiplexing of the data stream corresponding to the information contained in the mini-cell header is implemented in the distribution of the data.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19755121.1 | 1997-12-11 | ||
| DE19755121 | 1997-12-11 | ||
| DE19807186A DE19807186A1 (en) | 1997-12-11 | 1998-02-20 | Device and method for sending and / or receiving data in an SDH or. PDH transmission system |
| DE19807186.8 | 1998-02-20 | ||
| PCT/DE1998/003456 WO1999030527A1 (en) | 1997-12-11 | 1998-11-23 | Device for transmitting and/or receiving data in an sdh or pdh transmission system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2314253A1 true CA2314253A1 (en) | 1999-06-17 |
Family
ID=26042380
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002314253A Abandoned CA2314253A1 (en) | 1997-12-11 | 1998-11-23 | Apparatus for sending and/or receiving data in an sdh or, respectively pdh transmission system |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1040711B1 (en) |
| CA (1) | CA2314253A1 (en) |
| ES (1) | ES2239411T3 (en) |
| WO (1) | WO1999030527A1 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3405800B2 (en) * | 1994-03-16 | 2003-05-12 | 富士通株式会社 | ATM-based variable-length cell transfer system, ATM-based variable-length cell switch, and ATM-based variable-length cell switch |
| JPH07297830A (en) * | 1994-04-21 | 1995-11-10 | Mitsubishi Electric Corp | Multiplexer, non-multiplexer, switching device, and network adapter |
-
1998
- 1998-11-23 ES ES98963375T patent/ES2239411T3/en not_active Expired - Lifetime
- 1998-11-23 WO PCT/DE1998/003456 patent/WO1999030527A1/en active IP Right Grant
- 1998-11-23 EP EP98963375A patent/EP1040711B1/en not_active Expired - Lifetime
- 1998-11-23 CA CA002314253A patent/CA2314253A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| EP1040711B1 (en) | 2005-05-11 |
| WO1999030527A1 (en) | 1999-06-17 |
| ES2239411T3 (en) | 2005-09-16 |
| EP1040711A1 (en) | 2000-10-04 |
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| FZDE | Discontinued |