WO1998025374A1 - Process and device for transmitting at least one part of a digital message from a first to a second equipment - Google Patents
Process and device for transmitting at least one part of a digital message from a first to a second equipment Download PDFInfo
- Publication number
- WO1998025374A1 WO1998025374A1 PCT/DE1997/002653 DE9702653W WO9825374A1 WO 1998025374 A1 WO1998025374 A1 WO 1998025374A1 DE 9702653 W DE9702653 W DE 9702653W WO 9825374 A1 WO9825374 A1 WO 9825374A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- message
- arrangement
- data
- repeat
- information
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
- H04L1/0083—Formatting with frames or packets; Protocol or part of protocol for error control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1809—Selective-repeat protocols
Definitions
- Digital information is often transmitted in the form of so-called data packets, which have a predeterminable number of bits.
- a data packet to be transmitted is referred to below as a digital message.
- a data packet usually contains control information and information data.
- the control information contains control information and, for example, additional information for error detection or correction of errors that occurred during the transmission.
- information data is to be understood to mean any bit sequences with which, for example, audio data, video data or also textual data, eg. B. Data that are in ASCII format are described.
- FIG. 3 a conventional structure of a data packet for transmitting information data is known from document [1].
- the digital message 301 has control information 302 and information data 303.
- the control information 302 contains a so-called synchronization flag 304 and a header field 305.
- the synchronization flag 304 can consist, for example, of a 15-bit PN sequence. The functioning of the pseudo-noise (PN) sequence is explained in more detail in [3].
- the PN sequence is used to determine the beginning of the respective digital message 301 in a continuous bit stream.
- the header field 305 contains i.a. for example the so-called multiplex code, which points to an entry in a multiplex table. An entry in the multiplex table specifies the number, the assignment of the digital message 301 to a specific application and the respective length of the digital messages 301.
- the digital message 301 is usually assigned to an application. The application is called a logical channel. In this way, the number and type of digital message 301 is uniquely defined with the multiplex code of header field 305.
- the information data 303 contain any predetermined number of information data parts 306, 307.
- a first information data part 306 is, for example, an area in which audio data are transmitted.
- video data transferred.
- An information data part 306, 307 can also, for example, textual data.
- FCF backward control field
- BCF backward control field
- the information data part 306, 307 contains useful information 403, e.g. the video data, the audio data or the textual data.
- the forward control field 401 and the backward control field 402 are always used if bidirectional transmission is possible.
- the use of the forward control field 401 and the backward control field 402 is not essential in the context of the method according to the invention.
- the forward control field 401 has, for example, 32 bits, only 11 bits representing information (cf. FIG. 5a). These 11 bits are protected, for example, with a BCH (31, 11) encoder. This error detection method is explained in [2]. If errors occur within the forward control field, these can be up to a maximum number of BCH
- 5a shows an 11-bit information field 501 of the forward control field 401 for textual data or video data.
- the individual numbers 1, 2, 3, ..., 11 denote the respective bit position within the information field 501.
- the unique number of the information data part 306, 307 to be transmitted is indicated by means of a sequence number forward (SNf) 502, which has a length of 5 bits, for example.
- a control flag 503 serves to indicate that a subsequent piece of information begins with stuffing bits, which are referred to as filler data 201, or not begins.
- An RN flag 504 is used in the known method only for video data in the so-called Automatic Repeat Request Mode II (ARQII).
- ARQII Automatic Repeat Request Mode II
- the RN flag is used to recognize the individual packets or to detect missing packets.
- the RN flag is modulo 2 of the packet number, ie 0 or 1.
- a 4-bit cyclic redundancy check (CRCf) 505 serves as a checksum for the previous 7 bits. The previous 7 bits are checked for correctness based on the checksum.
- the backward control field 402 is shown in FIG. 5b. It also contains 11 bits of information that are protected with a BCH (31, 11) encoder.
- the first part of the BCF contains a so-called supervisory message (SM) 510 and a sequence number backward (SNb) 511.
- SM supervisory message
- SNb sequence number backward
- the individual bits of the first part of the BCF 402 are evaluated and thus the Type of information data parts 306, 307 determined.
- the second piece of information data i.e. For example, video data are to be transmitted in the repeat message
- a new first information data part 306 in the form of new audio data is also to be transmitted in the repeat message and the new first information data part is larger than the first information data part 306 of the digital message 301, so that is sufficient no longer available space in the message 301 in the information data 303 for the second information data part 307.
- the same problem also arises when the number of logical channels to be transmitted is increased and thus the length of the respective digital message or repetition message available for each intermediate channel is reduced.
- the same problem also arises when the length of the message 301 is reduced. This also reduces the available length if only one piece of information data 306, 307 is available.
- a BCH (31, 11) encoder for error detection and the associated error detection method is explained in [2].
- PN sequence is used to determine the beginning of the respective digital message in a continuous bit stream.
- the invention is therefore based on the problem of specifying a method for transmitting a digital message with which the problems described above are avoided.
- a digital message is transmitted from a first arrangement to a second arrangement.
- the digital message has at least one piece of information data that can be specified.
- a repeat message is formed in the first arrangement, which contains at least part of one of the information data parts of the digital message.
- at least one further repetition message is formed which contains information data of the information data part not contained in the repetition message. Both the retry message and the at least one further retry message are transmitted from the first arrangement to the second arrangement.
- control information has a repetition sequence with which the respective information data part is uniquely identified in the repetition message and in the further repetition message. This procedure enables a clear assignment of the respective information data parts and simple control of the control flow.
- filler data 201 to the further repetition message if the further repetition message must contain more data than the information data of the further repetition message. This ensures that the specified size of the respective data packet can always be maintained.
- control information additionally contains a sequence number for the respective repetition message and the associated further repetition message, monitoring of the data stream and simple error detection can be implemented.
- Figure 1 is a sketch in which the transmission of messages between a first arrangement and a second arrangement is shown symbolically.
- 2a to 2c a digital message (Fig. 2a), a
- FIG. 2b Repeat message
- FIG. 2c a further repeat message
- 3 shows a sketch in which a possible structure of a digital message is shown
- 4 shows a sketch in which a possible structure of an information data part is sketched
- 5a and 5b are sketches in which the possible structure of the forward control field (FIG. 5a) and the backward control field (FIG. 5b) are shown
- the digital message 301 is formed in a first arrangement 101, coded and transmitted to a second arrangement 102. In the second arrangement 102, the digital message 301 is received, decoded and further processed in accordance with the information contained in the digital message 301.
- a repeat request message 103 is formed by the second arrangement 102 and sent to the first arrangement 101.
- At least one information data part 306, 307 of the digital message 301 is requested for retransmission. This may be necessary, for example, if the requested information data part 306, 307 was incorrectly transmitted in the digital message 301.
- the indication that an information data part 306, 307 is to be retransmitted can be made, for example, by means of a so-called selective retransmission message (SREJ), as defined in [1].
- SREJ selective retransmission message
- the bit assignment for various supervisory messages is specified for the specific application. Using the bit assignment, it is possible for a recipient of a message to determine the type of the message.
- a selective retransmission message contains, for example, a value of zero in the first two bits in the field of the supervisory message and the reverse sequence number 511 in the five subsequent bits (cf. also FIG. 5b). If, for example, the second information data part 307 is requested again by the repeat request message 103, but not a retransmission of the first information data part 306, a repeat message 104 is formed by the first arrangement 101.
- the first information data part 306 of the repeat message 104 contains new information data.
- the number of bits in the first information data part can exceed the original number of bits in the first information data part 306 of the digital message 301. This creates the problem that, given a fixed number of bits in the repeat message 104, the second information data part 307 of the message 301 can no longer be completely included in the repeat message 104.
- At least one further retry message 105, 106, 107, ... is formed by the first arrangement 101 and transmitted to the second arrangement 102 for the case in question.
- a repeat message 104 and a number of further repeat messages 105, 106, 107,... Are formed, encoded and transmitted to the second arrangement 102 depending on the size of the respective first information data part 306 and the second information data part 307.
- the signaling that the respective data packet is a repeat message 104 or a further repeat message 105, 106, 107, ... is specified in the BCF, for example. For example, this is done by three consecutive bits with the value logic one in the supervisory message 510.
- the respective number of the repeat message or of the further repeat message 105, 106, 107, ... is for example with the reverse sequence number 511, which now has a length of 4 bits.
- the second information data part 307 of the respective further repetition message 105, 106, 107, ... contains information data of the requested information data part 307 which could no longer be included in the second information data part 307 of the repetition message 104 (see FIGS. 2a, 2b, 2c). .
- the retry message 104 and the further retry message 105, 106, 107, ... are received by the second arrangement 102.
- the BCF is evaluated and, depending on the decoding method selected, the decoding is started immediately or also after receipt of all repetition messages 104 or further repetition messages 105, 106, 107,... It is not clear from the start how many further retry messages 105, 106, 107, ... are transmitted. For this reason, the last retry message must be clearly identifiable.
- the indication of whether stuffing is taking place can be contained, for example, in the ST flag 503 of the forward control field 401 (cf. FIG. 5a).
- the last repetition message in each case is clearly identified, for example, by the number zero. If the use of filler data 201 is necessary for the last repetition message, this can be done; if not, no filler data 201 is used.
- any number can be used to uniquely identify the last further repeat message, for example in the reverse sequence number 510.
- Repeat message 104 is clearly possible. Generally can the reverse sequence number also contain more or less than 4 bits.
- n-1 octets are filled with a first binary value and the last octet with a second binary value.
- the second arrangement 102 can search for a sequence of 8 bits with the second binary value using a correlation receiver, for example. If it has found this, the remaining octets of the information data are assigned to the last further repeat message.
- the method can be used very advantageously in the context of the so-called ITU H.324 (H.324 / M and H.223 / Annex A) method for the transmission of multimedia information.
- the format used for the digital message 301 or the repeat message 104, the further repeat messages 105, 106, 107,... And the repeat request message 104 is arbitrary.
- the format just has to can be interpreted correctly by the respective arrangement.
- the header field 305 can also be protected with a short BCH (15, 11) instead of with a BCH (31, 11). This short BCH shortens field 305 to 15 bits.
- the identical short BCH field can be added at the end of digital message 301.
- Repetition message 104 and further repetition messages 105, 106, 107, ... are sent, for example after a predefinable time, a timer, after no positive acknowledgment message has been sent by the second arrangement 102 for the digital message 301 and has been received by the first arrangement .
- 105, 106, 107, ... is generally arbitrary.
- the information data part 306, 307 contains a separate forward control field 401 and a backward control field 402. In one variant, these two fields can also be combined, for example in a control field.
- the backward control field 402 contains a 4-bit reverse sequence number 510. Instead of assigning each subpacket its own reverse sequence number, each subpacket could also be signaled by a 1-bit reverse sequence number. This 1-bit number is formed, for example, by modulo 2 calculation of the subpacket.
- the signaling of the last repeat message 105, 106, 107,... Can also be achieved by a separate supervisory message.
- the method can be clearly described in that repeatedly transmitting information data parts 306, 307, which cannot be transmitted in a repeat message 104, are divided into a plurality of information data parts, which are transmitted in at least one further repeat message 105, 106, 107, ...
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- Computer Networks & Wireless Communication (AREA)
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Abstract
Description
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP52504198A JP2001505742A (en) | 1996-12-05 | 1997-11-12 | Method and system for transmitting at least a portion of a digital message from a first device to a second device |
EP97951072A EP0943194A1 (en) | 1996-12-05 | 1997-11-12 | Process and device for transmitting at least one part of a digital message from a first to a second equipment |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19650540 | 1996-12-05 | ||
DE19650540.2 | 1996-12-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998025374A1 true WO1998025374A1 (en) | 1998-06-11 |
Family
ID=7813765
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1997/002653 WO1998025374A1 (en) | 1996-12-05 | 1997-11-12 | Process and device for transmitting at least one part of a digital message from a first to a second equipment |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0943194A1 (en) |
JP (1) | JP2001505742A (en) |
CN (1) | CN1240080A (en) |
WO (1) | WO1998025374A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5983384A (en) * | 1997-04-21 | 1999-11-09 | General Electric Company | Turbo-coding with staged data transmission and processing |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2287383A (en) * | 1994-03-11 | 1995-09-13 | Motorola Ltd | Notification by energy burst of messages with unacceptable quality |
EP0685952A1 (en) * | 1994-06-01 | 1995-12-06 | International Business Machines Corporation | Improved channel interfaces for computer input/output channels |
-
1997
- 1997-11-12 EP EP97951072A patent/EP0943194A1/en not_active Withdrawn
- 1997-11-12 WO PCT/DE1997/002653 patent/WO1998025374A1/en not_active Application Discontinuation
- 1997-11-12 CN CN 97180377 patent/CN1240080A/en active Pending
- 1997-11-12 JP JP52504198A patent/JP2001505742A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2287383A (en) * | 1994-03-11 | 1995-09-13 | Motorola Ltd | Notification by energy burst of messages with unacceptable quality |
EP0685952A1 (en) * | 1994-06-01 | 1995-12-06 | International Business Machines Corporation | Improved channel interfaces for computer input/output channels |
Also Published As
Publication number | Publication date |
---|---|
JP2001505742A (en) | 2001-04-24 |
EP0943194A1 (en) | 1999-09-22 |
CN1240080A (en) | 1999-12-29 |
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