WO2005112330A1 - Method and transmitter and receiver for transmitting digital information packets in a data network - Google Patents

Method and transmitter and receiver for transmitting digital information packets in a data network Download PDF

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Publication number
WO2005112330A1
WO2005112330A1 PCT/EP2005/052242 EP2005052242W WO2005112330A1 WO 2005112330 A1 WO2005112330 A1 WO 2005112330A1 EP 2005052242 W EP2005052242 W EP 2005052242W WO 2005112330 A1 WO2005112330 A1 WO 2005112330A1
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WO
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Prior art keywords
packets
point
data
information
characterized
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Application number
PCT/EP2005/052242
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German (de)
French (fr)
Inventor
Jürgen PANDEL
Original Assignee
Siemens Aktiengesellschaft
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements 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
    • H04L1/18Automatic repetition systems, e.g. van Duuren system ; ARQ protocols
    • H04L1/1812Hybrid protocols
    • H04L1/1819Hybrid protocols with retransmission of additional or different redundancy
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements 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
    • H04L1/18Automatic repetition systems, e.g. van Duuren system ; ARQ protocols
    • H04L1/1867Arrangements specific to the transmitter end
    • H04L1/188Time-out mechanisms
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/02Details
    • H04L12/16Arrangements for providing special services to substations contains provisionally no documents
    • H04L12/18Arrangements for providing special services to substations contains provisionally no documents for broadcast or conference, e.g. multicast
    • H04L12/1863Arrangements for providing special services to substations contains provisionally no documents for broadcast or conference, e.g. multicast comprising mechanisms for improved reliability, e.g. status reports
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L2001/0092Error control systems characterised by the topology of the transmission link
    • H04L2001/0093Point-to-multipoint

Abstract

The invention relates to a method for transmitting digital information packets in a data network comprising stations designed to exchange data from at least one transmitting station to at least two receiving stations. The information packets that are to be transmitted are divided up into one or more data packet groups in the transmitter station, and redundancy information in the form of redundant packets is added to each data packet group. If the receiver station receives a defective data packet, or if one of the packets in the data packet group is not received, the receiver station sends the transmitter station a negative acknowledgement protocol and the transmitter station initiates error protection measures. The transmitter station establishes a level of error protection for each receiver station on the basis of a statistical analysis of negative acknowledgement protocols received in connection with a given information packet. The invention also proposes a method wherein packets lost in a streaming scenario are retransmitted and stored in the network station so that if the streaming content is transmitted with errors the first time it can be used again later without errors. The invention further relates to a transmitter-receiver device for carrying out the claimed method.

Description

description

A method, transmitter and receiver means for transmission of digital information packets in a data network

The invention relates to a method of transmission of digital information packets according to the preamble of claim 1 and a method according to the preamble of claim 13. The invention further relates to a transmitting device according to claim 14 and a receiving device according to claim 15 °.

In the digital data transmission, the problem arises that data is lost due to poor transmission connections or low bandwidth during transmission. Especially with packet-oriented traffic faulty or lost data lead to a loss of complete packages, whereby the content can not be reproduced correctly. Particularly problematic are DA loss of data when called. Multimedia applications where the

Data are often displayed in real time, without delay at the receiver.

From J. Rosenberg, H. Schulzrinne: "An RTP payload for at for generic forward error correction", IETF RFC 2733, Dec. 1999, previous data packets are to solve this problem methods for reconstructing lost known.

So-called. Broadcast and multicast data transmissions are known in which data is transmitted from a single transmitter and can be received by a plurality of receivers. These data transfers Reed-Solomon codes called for error protection. Be used like Shu lin and Daniel Costello, "Error Control Coiding," Prentice Hall, 1983, known. Using the Reed-Solomon code is added to data redundancy, so that in the not too large loss of data at the receiver the original data can are designed at recon-. Known error protection methods with- help of Reed-Solomon codes are, for example, especially for the "DVB-H System Description", Doc. DVB H153rl TM2939rl, 09.09.2003, specified DVB-H standard (Digital Video Broadcast - Handheld). Thus, for example using one of Shu Lin and Daniel Costello, "Error Control COI ding", Prentice Hall, 1983, known (N, K) -Read Solomon code, the data will also be reconstructed when a total of N packets, K packets payload and NK parity (parity or redundancy) contain data lost a maximum of NK any packages. The disadvantage here is that Read Solomon code based on Galois Field GF (2 8) have a limitation in that N may be a maximum value having the 255th

IEEE Transactions on Information Theory, Vol "low density parity check codes", 8 Jan. 1962, described low-density parity-check code (LDCP- codes) used: For any package figures are often therefore also in RG Gallager. (!) , These have the disadvantage that they are not as efficient in, for example when using Read Solomon Code based methods; ie they can not all NK lost packets are reconstructed.

Therefore, it follows that in the used in practice procedures in general, not all the lost or erroneous packets can be reconstructed so that they again additional such packets separately on point-to-punk connections to the individual receiving stations (stations) to to ship. To the receiving stations in the event of lost (not received) or faulty packets is a so-called NACK protocol (emergency acknoledge) - so a negative acknowledgment - tion to the sending sta- (server) sent the broadcast / multicast network, the NACK indicating which package was incorrectly or not received, so the server knows which packets have to be retransmitted on the consider to be reliable point-to-Punk connection to the individual receiving stations.

An alternative approach to this is from M. Luby et. al .. "The use of forward error corrextion (FEC) in reliable multicast," IETF RFC 3453, Dec. 2002, announced in the previous lost instead of repetition or faulty packets only additional redundancy packets yet it allows a reconstruction of the packets carry out, on the point-to

to send multipoint connection to all the receiving subscriber stations. By this method, however, unnecessarily large amounts of data are transmitted over the point-to-multipoint connection, since regardless of the actual number of recipients (receiving stations), which packages do not have or only receive faulty, always sent to all subscriber stations additional redundancy packages become.

The object underlying the invention is to drive a comparison to provide a transmitting device and a receiving device for the transmission of digital information packets in a data network, which provide an increased efficiency.

This object is achieved starting from the method according to the o- berbegriff of claim 1 by its characterizing features as well as the method according to the preamble of claim 13, the transmitting device according to claim 14 as well as the receiving device according to claim 15 dissolved.

In the inventive method for the transmission of digital information packets in a data network for the exchange of data configured will stations of at least one transmitting station to at least two receiving stations in which the information to be transmitted packets are divided into the transmitting station in one or more data packet groups and the data packet groups each redundancy information is added in the form of redundancy packets and averages in which of these exceeds a negative reception protocol to the sending station for defective and non-receipt of a data packet of the data packet group from the receiving station and are thereby triggered by the transmitting station measures for error protection, by the transmitting station, a degree of error protection measures in dependence on a statistical evaluation of a received information packet associated negative reception protocols each receiving station festg elegt.

The inventive method an adaptation of error protection is achieved to the current conditions of the data network, so that a more efficient use of resources is possible. Preferably, statistical analysis is carried out by the determination of a statistical distribution of the received negative Ξmpfangsprotokolle. In this way, the transmitting station is able to determine a number of necessary redundant packets, which is needed in order to ensure that a plurality of receiving stations can reconstruct the missing data packet using the redundant packets. This ensures that not always transmitted to all receiving stations redundancy packages, but this example actually takes place only when necessary and only to the extent that does not burden the network or uses resources efficiently.

This adjustment can be made more precise the current benheiten assured when the statistical analysis is supplemented by determining a related to the distribution of the statistical mean value and / or by determining an associated to the distribution statistical standard deviation.

Represents the transmitting station based on the statistical analysis the degree of error protection measures such one that the transmitting station determines a required for maintaining a definable criterion number of redundancy packets for information to be transmitted packets can be achieved by setting the criterion, a further optimization of the method achieve wherein the criterion can be determined for example by simula- tion or experimental approaches.

Preferably, the criterion is a number of those receiving stations which should be by setting the number of redundancy packets fully able to reconstruct missing and erroneous data packets based on the determined number of redundancy packets. This makes it possible in an appropriate manner, a parameter for reducing the cost set as the number of stations also determines the amount of data to be transmitted. In particular, in addition, it is therefore advantageous if the remaining receiving stations of the known prior art error protection mechanisms, in particular the one in which the respective remaining receiving station a repeated transmission of data packets with a negative reception logs via a point-to-point compound is transferred, is applied, so that overall there is a defined degree of error protection measures by a distribution in a known error protection measures. This makes it possible to find a suitable mix, which enables compliance gegebe- ner criteria perfectly.

In particular, if it is to be achieved in the efficiency by reducing the cost factor, it is advantageous if the criterion is set such that a cost value K is qesarat minimized, whereby the cost value

Kgeaamt S g e 3am - - D m K m + DuK u D u: = amount of data by means of point-to-point connection, D m: = amount of data by means of point-to-multipoint connection, κ u: = cost of transfer of a pre-entered data quantity via a point-to-point Verbinung, K ra: = cost of transferring a pre-entered data quantity via a point-to multipoint Verbinung,

In addition, this development has the advantage in data networks, which are designed to point-to-point connections or point-to-multi-point connections, to achieve an accurate optimization based on a precise cost estimate.

Especially if it is a server for a download broadcast is at the transmitting station multicast service, and at least some of the receiving stations use this service as a point on a point-to-multipoint connection, it is advantageous if during transmission an information data packet involves detection of received negative reception logs, after completion of transmitting the information packet, the statistical evaluation of the received negative reception protocols is performed, and based on the evaluation of the number of for transmission over the point-to-multipoint connection for the fulfillment of the criterion redundancy packets required and the number of re via a point-to-point connection to be transmitted missing or erroneous data packets is determined. Alternatively, the evaluation can take place during transmission of packets of information, so this allows for faster processing and thus a better fit in time-critical applications.

Contrary to the process described is for data networks in which operated the transmitting station as a server for a streaming broadcast multicast service, and at least a portion of the receiving station in the form of a point-to-multipoint connection is used, advantageous if one during the emission of information data packet a detection of received negative Ξmpfangsprotokollen, carried out statistical evaluation of the received negative reception protocols is performed during transmission of the information packet in a first time window and on the basis of the determination of the number of for transmission over the point-to-multipoint connection to fulfill the criterion required redundant packets is determined.

the duration of the first time window, is preferred here to set such that it is smaller selected a duration of a predetermined second time window. This will take into account the fact that one in streaming systems

Restriction regarding the allowable delays exist, which is such that a delay of a predetermined time value may not exceed. If so as suggested according to the development, the first time window is selected such that its duration is shorter than the time restriction in streaming data networks, there is by determining and transmitting redundancy packets have enough time to reconstruct at least a portion of the missing or erroneous data packets , Alternatively, however, especially in addition to the procedures described, it is in a data network, in which the transmitting station is operated as a server for a streaming broadcast multicast service, and at least a portion of the received stations this service in the form of a point-to-multipoint connection uses, wherein the receiving station for storing data are configured advantageous that to information packets associated missing and erroneous data packets are retransmitted via a point-to-point connection and stored in the respective receiving station. This makes it OEG lent that although participating stations receiving reproduce faulty data during transmission, but the possibility is given to a user of this service, after transmission to carry out error-free reproduction of the data.

The object is further achieved by a transmitting device and a receiving device, which have means for carrying out the individual process steps according to the inventive method and usually both are implemented in a station, and have the advantage of a station of the data network for carrying out the method and thus to enable the achievement of the above mentioned advantages of the process of the invention.

Further advantages and embodiments of the invention are illustrated in FIGS. 1 to 3

Show it:

Figure 1 is a schematic representation of a data network in which the inventive method is applied; Fig

Figure 2 Exemplary flow diagram of the method according to the invention;

Figure 3 Histogram of participants above data network who have lost a number n packets.

1 shows a preferred scenario in which the inventive method can be used. This is about the transmission of multimedia data of a broadcast service that transmits data simultaneously from multiple receivers (stations) can be received. The multimedia data is provided by a broadcast multicast service center BM-SC and transmitted via any intermediate network z to a mobile radio network RAN ​​(RAN Radio Access Network). The mobile radio network RAN ​​comprises a plurality of base stations Bl to B5, by means of which the multimedia data to the user terminals via an air interface L (receiving stations) UE1..UE3 (UΞ = User Equipment) are transmitted in the form of a mobile phone. The Broadcast Multicast Service Center BM-SC generates information packets that include a header and a payload, wherein the information packets are data packets which are transmitted by means of a transport layer according to the OSI reference model, wherein the transmission by wire and / or wireless takes place here , In the scenario depicted in Figure 1 ie a data transmission over a cellular network and also carried out the data transported over packet-oriented transport layer.

Starting from this preferred scenario three possible embodiments of the method according to the invention will now be described.

In a first from EADERSHIP example, which is used in the said broadcast multicast scenario used in a first step Sl of the Broadcast Multicast Service Center BM-SC, which can be viewed as a transmitting station, and a server of this broadcast multicast scenario download service offered (service) functions, proceed so that first all user data (informationspa- kete) over the broadcast channel, ie UE (leadership for over a point-to-multi-point connection to the receiving stations in training just one stop shown) to be transmitted.

Parallel to send, running as a background process in the control algorithm, S2 negative reception protocols (NACKs, Negative Acknowledges) are recognized by the server BM-SC in a second step.

In a third step S3 of the information packet by the server BM-SC, a statistical distribution of the negative reception protocol signals (NACK signals) calculated upon completion of sending.

This distribution arises, for example as a histogram of the number of receiving stations which have lost a number N of data packets. In a fourth step S4 is now determined from the distribution of the number of redundant packets via the broadcast channel, that is on the point-to -Mehrpunkt compound are emitted and also how many of the missing or erroneous data packets to the receiving stations must be repeatedly transmitted in each case via a point-to-point connection, that is, in the fourth step S4 is defined basically as the distribution is set out Fehlersσhutzmaßnahmen how the incremental redundancy and packet repetition.

It can be found in a fifth step S5, have gone that again lost data packets including redundancy packages and this in turn acknowledged by the relevant empfan- constricting stations NACK signals so that, for example, in a sixth step S6 serving as the server transmitting station BM-SC can decide nachzusenden redundancy packets until a sufficiently small amount of packets over point-to-point connections to repetitive data remains. Here, the server BM-SC therefore always be considered one on the point-to-multipoint connection to transfer data volume and a transmitting via the point-to-point connection amount of data and can hereby advantageously take on the resulting accrual of the total cost of the transfer effect, so that this ideally be minimized.

In a seventh step S7, the process is finally terminated.

Alternatively to the described embodiment, the place in the third step S3, calculation of the statistical distribution may already take place during transmission of the user data in the same preferred scenario, so that an early start already by this statistic which is based on the NACK signals so that can emit more redundancy packages. A third embodiment of the inventive method results when in the underlying preferred scenario, so the broadcast multicast system, a Strea- ming service is offered.

Such streaming system is time-critical, so that a delay due to the necessary reconstructions of data packets of the information packets on the basis of additional redundancy packets sent lent is subjected to restriction, ie for example a time of 5 s must not exceed.

It is of advantage that as mentioned in the second execution example, the additional redundancy packages will be sent even during transmission of the information packets associated data packets, ie the evaluation of the distribution or the statistics of the NACK signals have been during the emission of a s is carried given time window, for example, 3, so that the number can be determined according to the invention to be output redundancy packets within the remaining time up to the maximum allowable delay, so that at least a predetermined relative number of participating receiving stations, for example, 95% of the stations, all can reconstruct lost user data packets. This high predetermined number is therefore of particular distress or so advantageous because due to the delay restriction, it is not possible in the present embodiment to transmit missing packets over a point-to-point connection to the intended recipients again.

This is only possible if the receiving subscriber stations have the ability, that are designed such that they can store the related to the streaming service data. In such a case, the redundancy data packets according to the invention is provided to store data during the transmission of streaming. This allows the receiving stations, so those who have not had the opportunity in the embodiment 3, to reconstruct missing or erroneous data packets, at least in transmission, ie data can enable correct displaying the data after first reception of the streaming, although this embodiment described fourth as stand-alone solution to the problem, namely, the efficient use of data networks can be configured, namely, if the storage may be realized by all received subscriber stations and not only by those who can perform which lost no reconstruction lost data according to embodiment 3.

Claims

claims
1. A method of transmission of digital information packets in a data network with data exchange exclusively designed stations of at least one transmitting station (BM-SC) to at least two receiving stations (UE) in which the information to be transmitted packets (in the transmitting station BM-SC ) are divided into one or more data packet groups and the data packet groups each redundancy information in the form of redundancy packets is added, and in which (in case of faulty and missing reception of a data packet of the data packet group from the receiving station UE) a negative reception protocol (from this to the transmitting station BM- SC) transmitted and thereby (by the transmitting station BM- SC) are triggered measures for error protection, characterized in that (by the transmitting station BM-SC) packet, a degree of error protection measures in dependence on a statistical evaluation of a information associated received negative r reception protocols each receiving station is determined.
2. The method according to claim 1, characterized in that a statistical distribution of received negative reception protocols is determined as the statistical analysis.
3. The method according to claim 2, characterized in that the static analysis is supplemented by determining a related to the distribution of the statistical average value.
4. The method of claim 2 or 3, characterized in that the static analysis is supplemented by determining a related to the distribution of the statistical standard deviation.
5. The method according to any one of the preceding claims, characterized in that the transmitting station (BM-SC) based on the static evaluation protective measures the degree of mis set such that the transmitting station (BM-SC) one for a maintenance of a definable criterion required number of redundancy packages for future information to be transmitted packets determined.
6. The method according to the preceding claim, characterized that the number of those receiving stations (UE) reproducing size is defined by the criterion that should be by setting the number of redundancy packets fully capable denotes Ge, missing or erroneous data packets based on the ER mediated number of redundant packets to reconstruct.
7. Method according to the preceding claim, characterized in that for the remaining receiving stations of the prior art well- known error protection mechanisms, in particular to the respective remaining receiving station a repeated transmission of data packets with a negative reception logs via a point-to- point connection is performed.
8. The method according to one of the two preceding claims, characterized in that the criterion is set such that a cost value "K gΘsamt" is minimized, whereby the value K ge including from K qesam t = D m K m + D U K Getting Connected = amount of data by means of point-to-multipoint, K u:: U with D ": = amount of data by means of point-to-point connection, D m = cost of transferring a vorgege-
surrounded amount of data via a point-to-point connection, κ m: = cost of transferring a given amount of data over a point-to-Mehrpunktverbinung yields.
9. The method according to any one of the preceding claims, in which operated the transmitting station as a server for a "down load broadcast / multicast" service and at least used by a part of the receiving stations in the form of a point-to-multipoint connection, characterized that a) involves detection of received negative reception logs during transmission of information data packets, b is the statistical evaluation of the received negative reception protocols is performed) after the completion of sending of the information packets, c) based on the evaluation cl) the number of a transmission the point-to-multi-point connection is determined to fulfill the criterion required redundancy packets and c2) the number of re via a point-to-point connection to be transmitted missing and erroneous data packets.
10. The method according to any one of the preceding claims, in which operated the transmitting station as a server for a "broadcast / multicast" service and at least used by a part of the receiving stations in the form of a point-to-multipoint connection, characterized in that a ) is carried out during transmission of information data packets detection of received negative reception logs, b) during the emission of the information packets the statistical evaluation of the received negative reception protocols is carried out, c) based on the evaluation cl) the number of point-transmission over the -Mehrpunktverbindung to meet the criterion necessary redundancy packets and c2) the number of re via a point-to-point connection to be transmitted missing and error-prone data packets is determined.
11. The method according to any one of the preceding claims, in which operated the transmitting station as a server for a "broadcast / multicast" service and at least used part of the receiving stations in the form of a point-to-multipoint connection, characterized in that a) is carried out during transmission of information data packets detection of received negative reception logs, b) according to during transmission of the packets of information within a first time window, the statistical evaluation of the received negative Empfangsproto- protocols takes place, c) based on the evaluation of the number of for transmission over the point-to-multipoint connection required to meet the criterion redundant packets is determined.
12. The method according to the preceding claim, characterized in that a duration of a predetermined second time window sets the duration of the first time window smaller.
13. Method, in particular according to one of Anprüche in which operated the transmitting station as a server for a "Download Broadcast / Multicast" service and at least used part of the receiving stations in the form of a point-to-multipoint connection, said receiving stations to storing data are arranged, characterized in that information to data packets associated missing and erroneously received data packets are re-transmitted via a point-to-point connection and stored in the respective receiving station.
14 in terminal device comprising means for performing method steps of the method according to any one of the preceding method claims.
15, receiving device characterized by means for performing the steps of the method according to one of the preceding method claims.
PCT/EP2005/052242 2004-05-14 2005-05-17 Method and transmitter and receiver for transmitting digital information packets in a data network WO2005112330A1 (en)

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