WO2001078295A1 - Procede pour transmettre des paquets de donnees dans un systeme de communication radio - Google Patents

Procede pour transmettre des paquets de donnees dans un systeme de communication radio Download PDF

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Publication number
WO2001078295A1
WO2001078295A1 PCT/DE2001/001427 DE0101427W WO0178295A1 WO 2001078295 A1 WO2001078295 A1 WO 2001078295A1 DE 0101427 W DE0101427 W DE 0101427W WO 0178295 A1 WO0178295 A1 WO 0178295A1
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WO
WIPO (PCT)
Prior art keywords
coding
information
pdu
header
data packet
Prior art date
Application number
PCT/DE2001/001427
Other languages
German (de)
English (en)
Inventor
Beate Gartner
Christina Gessner
Reinhard KÖHN
Christoph MECKLENBRÄUKER
Martin ÖTTL
Georgios Papoutsis
Fariba Raji
Dave Randall
Jörg SCHIEDENHARN
David Setty
Armin Sitte
Volker Sommer
Thomas Ulrich
Achim Von Brandt
Frank Wegner
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE10025281A external-priority patent/DE10025281A1/de
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to AU58214/01A priority Critical patent/AU5821401A/en
Publication of WO2001078295A1 publication Critical patent/WO2001078295A1/fr

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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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0064—Concatenated codes
    • H04L1/0066—Parallel concatenated codes
    • 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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0072—Error control for data other than payload data, e.g. control data
    • 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
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H04L1/1819—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of additional or different redundancy
    • 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
    • H04L2001/0098—Unequal error protection

Definitions

  • the invention relates to a method and a communication system, in particular a radio communication system, for the transmission of data in the form of packets.
  • information for example voice, image information or other data
  • the electromagnetic waves are emitted at carrier frequencies that lie in the frequency band provided for the respective system.
  • TD / CDMA Time Division / Code Division Multiple Access
  • UMTS Universal Mobile Telecommunications System
  • Frequencies in the frequency band of approximately 2000 MHz are provided.
  • PDUs - Protocol Data Unit data are often sent in packets (PDUs - Protocol Data Unit), which are provided, for example, with an identification number (sequence number, hereinafter also referred to as “identifier *).
  • sequence numbers are used so that the recipient can request additional information for correcting incorrectly transmitted packets.
  • the amounts of data sent in each case, individually or by a suitable combination for reconstruction the packet data on the receiver side serve as "coding units". These are the data packets to be transmitted in coded form.
  • the receiver side informs the sending station directly or indirectly of the sequence numbers of the unsuccessfully decoded coding units, which are then sent again by the sending station.
  • Hybrid ARQ II or Hybrid ARQ III method an incorrectly received (first) coding unit is linked with additional information subsequently requested by the transmitter (2nd, 3rd, ..., nth coding unit) in order to restore the data packet.
  • the coding units are coding polynomials, which e.g. are further processed using rate-atching processes.
  • Coding units are transmitted again and combined with a combination in the best possible ratio (maximum ratio combining) with the version already sent.
  • a “hybrid * ARQ mechanism combines an error correction on the receiving end with a return channel for signaling non-correctable transmission errors. In order to be able to use these methods, the mechanisms required for this must be anchored and optimized in the protocols of layer 1 and layer 2 in accordance with the OSI layer model.
  • CRC Cyclic Redundancy Check
  • the data packets are also used as PDUs (Protocol Data Units). These are from one
  • Protocol layer of the OSI layer model passed on to the next one.
  • User data is passed between the protocol layers by means of so-called "primitives *", which take over the control of the functions to be carried out on the basis of protocol parameters carried along.
  • layers 1 to 3 (layer 1 ... layer 3) and theirs is from the standardization document of 3GPP 3G TS 25.301, V3.4.0 (2000-03), “Radio Interface Protocol Architecture (Release 99) * Communication described to each other.
  • PDUs of a higher layer reach the RLC (Radio Link Control), which is a sub-layer of the second protocol layer, and which generally provides the PDUs with a header.
  • the PDU, now called RLC PDU is then passed on to the MAC (Medium Access Control), in which a further header can be added if necessary.
  • the PDUs are provided with an identification number (sequence number), which is transmitted in the header of the RLC PDU, in order to be able to request an incorrectly received data packet again, as described above.
  • the decisive factor for the efficiency of the hybrid ARQ method is that the header, which contains the sequence number, among other things, can be clearly assigned to the associated data packet and that the corresponding data packet can be clearly identified on the basis of its sequence number. For this it is necessary that the sequence number can be reliably recognized or decoded in the receiver.
  • the header should therefore accordingly well protected against any interference that may occur during transmission via the radio interface.
  • the invention has for its object to enable a secure transmission of the information of the header of a data packet.
  • FIG. 1 shows a section of a radio communication system
  • FIG. 2 shows the layers of the ISO layer model
  • Figures 3 u. 4 shows the method according to the invention for coding a header and a data packet on the transmitter side
  • FIG. 5 shows the method according to the invention carried out at the receiving end
  • FIG. 6 shows a more detailed illustration of FIG. 4.
  • Fig. 1 shows a part of a mobile radio system as an example of the structure of a radio communication system.
  • a mobile radio system consists of a large number of mobile switching centers MSC, which belong to a switching network (SSS - Switching Subsystem) and are networked with one another or provide access to a fixed network, and each have one or more base station systems (BSS - Base Station Subsystem), which are connected to these mobile switching centers MSC.
  • a base station system in turn has at least one device (RNC - Radio Network Controller) for assigning radio resources or a base station controller BSC (Base Station Controller) and at least one base station BTS (Base Transceiver Station, also referred to as Node B) connected to it.
  • a base station BTS can set up and trigger connections to communication terminals or subscriber stations MS, such as mobile stations or other mobile and stationary terminals, via a radio interface.
  • At least one radio cell Z is formed by each base station BTS
  • Cell structures can also be supplied to several radio cells Z per base station BS.
  • the functionality of this structure can be transferred to other radio communication systems, such as, for example, wireless access networks, in which the development described below can be used.
  • the base station is considered as a transmitter and the mobile station as a receiver.
  • 2 shows the OSI reference model. It builds up in succession from the physical layer, the data link layer, the network layer, the transport layer, the session layer, the presentation layer and the application layer.
  • the continuous lines represent the real communication between the layers, the dotted lines the communication via logical channels between the instances of the same layer of the communicating subscriber stations A and B, for example between the base station BTS and the subscriber station MS.
  • the physical layer (layer 1) forms the basis for the communication and contains the communication medium, the physical channel.
  • the task of the data link layer (layer 2) is to interpret the bit stream of the physical layer as a sequence of data blocks and to pass them on to the network layer without errors. Protection against transmission errors takes place in the data link layer and from here, if transmission errors are detected, a new transmission of a data block is initiated.
  • the network layer (layer 3) is responsible, among other things, for setting up, operating and triggering connections between open systems and multiplexing.
  • FIG. 3 shows the data flow according to the invention within layers 2 (L2) and 1 (Ll).
  • the representation is based on FIG. 9 on page 22 of the above-mentioned standardization document 3G TS 25.301.
  • the process can be done within the framework
  • the invention can also be applied to the data flows described in FIGS. 8 and 10 of this document.
  • the method according to the invention advantageously uses so-called interlayer communication, i.e. the communication between the protocol layers of the OSI layer model.
  • interlayer communication i.e. the communication between the protocol layers of the OSI layer model.
  • communication and data exchange between the protocol layers take place, for example, using the primitives already mentioned, which can be provided with additional parameters as control information.
  • any type of interlayer communication can be used within the scope of the invention.
  • a protocol for example the RLC, forwards the complete header information or parts thereof in addition to or in addition to the PDU to the lower layers when forming the header of a PDU .
  • the lower layers receive this information on the one hand explicitly (without a link to the associated data packet) and on the other hand implicitly (linked to the associated data packet) and therefore not separately accessible in the PDU header.
  • the explicit disclosure of the header information can e.g. happen in the form of the parameter lists that are exchanged with the primitives between the layers.
  • the data flow diagram in FIG. 3 is based on the fact that in layer 2 RLC (L2 RLC) a data packet PDU coming from higher layers (higher layer) is supplemented by a header (RLC header).
  • This layer 2 RLC is referred to as non-transparent due to the addition of a header.
  • the RLC PDU formed in layer 2 RLC is together with the (implicit, ie with the data packet linked) RLC header passed to the layer 2 MAC, in which the formation of the transport block (transport block) takes place.
  • the added RLC header is also passed on separately without the transport block formation taking place in the normal processing branch to layer 1 (L1) with the aid of a primitive.
  • Layer 2 MAC is referred to as transparent, because in it the. ' No additional header is added to the data packet.
  • both the transport block and the separate header in layer 1 are encoded and CRC bits are added before it is transmitted via the radio interface (see FIG. 4 below).
  • This method according to the invention enables layer 1 to process the additional, separately available header information and, for example, encode it more strongly than the associated data packet PDU. After transmission via the radio interface, this information is again explicitly available in layer 1 at the receiving end. In this case, layer 1 passes this information on to the higher layers with the help of interlayer communication (FIG. 5).
  • the PDUs arriving in the receiver are processed in accordance with the known protocol functionality.
  • the corresponding headers are separated from the logs and read.
  • the header information received in the RLC is then again available in two versions, explicit and implicit, since the RLC "PDU header after the corresponding items have been decoded
  • Coding unit is readable again. This means that the RLC receives the information received in various ways can compare with each other, whereby transmission errors can be detected with a very high accuracy.
  • the header information (or parts thereof, or at least the sequence number of the respective data packet) more securely than the actual data packet with the user data. This can be achieved, for example, by stronger channel coding or interleaving of the header compared to the data packet. This is the case with the previous ones
  • the header is additionally secured by the implicit and the explicit transmission that takes place beyond that, incorrectly correctly accepted layer 1 CRC checks can be intercepted in the RLC by comparing the two transmitted headers,
  • the data backup of the header in layer 1 can be carried out with less effort since there is a further possibility for correction by comparing the explicit header with the implicit header. This is can be realized, for example, with a smaller number of CRC bits,
  • the method is suitable for both the FDD and the TDD mode of the UMTS mobile radio system.
  • the method is used particularly advantageously in a hybrid ARQ II method, since it is advantageous in this method if the header is transmitted with a higher level of security than the data. This applies in particular to the sequence numbers of the PDUs, since these are of great importance on the receiving end for correct decoding.
  • the method is not limited to specific protocol levels, but can always be used if header information is added in a protocol level, which is then transmitted — completely or partially — implicitly and explicitly via layer 1. See Figures 8 and 10 of the referenced 3GPP standardization document 3G TS 25.301.
  • the "explicit * header can be identical to the" implicit * header or can contain only part of the information of the latter. At least, however, it should have the sequence number of the data packet concerned.
  • the (complete) header can only be transmitted in the explicit manner mentioned above, so that the header and the associated data packet are then completely separated. Then not applicable the possibility of comparing two versions of the
  • Headers (explicit and implicit) in the recipient.
  • the advantage remains that the header can be coded separately from the associated data packet and thus also more securely than it.
  • the Hybrid ARQ Type II or III receiver can also use the header, for example in the form of a number, to tell how many coding units of the associated data packet with the specified sequence number (e.g. polynomial number 2, in called the figures “Redundancy Version ').
  • the transmitter can control and control information
  • Layer 1 can process the possibly additionally transmitted information of the explicit header independently of the associated data packet and encode it more strongly than this. This method will now be explained with reference to FIG. 4.
  • the layer 2 MAC provides a data packet or transport block with data (data) and an RLC sequence number SN of layer 1.
  • data data
  • RLC sequence number SN of layer 1.
  • the sequence number RLC SN and the number of the coding unit are transmitted as explicit header information.
  • the latter can assume the values 1 and 2 in the HARQ II (Hybrid Automatic Repeat Request II) error correction method, for example, since two different coding units can be transmitted in succession.
  • HARQ III the latter can assume the values 1 to 3.
  • This combination of data packet (possibly including the implicit headers) and explicit header RLC SN, "Reduncancy Version *" is split up, the data packet data being fed to the right processing branch and the explicit header to the left processing branch, both of which each have a CRC checksum is added (CRC Attachment).
  • the data packet Data is subsequently coded in a coding step, for example convolution or turbo.
  • the explicit header is also convolutionally or turbo-coded in the left processing branch with a comparatively better coding than the data packet, with the coding differentiation compared to the coding of the data packet by a different coding polynomial.
  • a selection of the coding unit to be transmitted of the respective data packet is subsequently carried out (redundancy selection), the selection in
  • the data packet coded as a coding unit and the coded explicit header are fed to subsequent processing steps of what is known as rate matching and mapping onto a physical transmission channel. They are then transmitted to the receiver within layer 1 via a common transport channel (which will be discussed in relation to FIG. 6).
  • the combination of the sequence number and the decoded data packet is then made available to the MAC (layer 2).
  • the results of the CRC check for the data packets are checked in the buffer / combining. If the result of the CRC check reveals that the associated data packet was decoded with errors, a further coding unit of the same data packet is requested. If necessary, this further coding unit and the originally received coding unit are combined with one another in order to obtain an error-free result when a new decoding attempt is made. Only when this is present or the error rate falls below a predetermined maximum error rate is the combination of sequence number and data packet passed on to the MAC layer, in which further processing takes place.
  • the method described with reference to FIGS. 4 and 5 has the advantage that the internal division or splitting of a transport channel has no effects for higher layers. It is advantageously used that parameters can be transferred to layer 1 with the aid of primitives. whose information may also be available in the header of the PDU. The transfer of the
  • Control information about the radio interface thus becomes an internal matter of protocol layer 1.
  • the method according to the invention offers the following
  • the (explicit) header is additionally secured by a stronger channel coding, - the transmission algorithms for the different ARQ types (I, II or III) differ only slightly from one another within protocol layer 2, so that it is possible to switch between these error correction methods, - if the header is implicit with the corresponding one
  • the data backup of the explicit header in layer 1 can be carried out with less effort, since there is another possibility of correcting it by comparing it with the implicit header.
  • the coding in the left branch of FIG. 4 does not even have to be larger than in its right branch. This can be achieved, for example, with a smaller number of bits for the CRC, - no additional effort is required to secure the header, since all the mechanisms described for ARQ processes are supported by the UMTS standard, and - the process is equally suitable for both the FDD and TDD mode of the UMTS mobile radio system.
  • FIG. 6 shows a more detailed exemplary embodiment of the coding of the data packets Data and the associated (explicit) headers shown in FIG. 4, which are in the protocol layer Ll is done.
  • a left coding branch is shown for the data packets Data and a right coding branch for the explicit headers.
  • each data packet is first provided with a CRC checksum and then segmented into individual coding blocks.
  • the channel coding is then carried out.
  • sub-groups of data which form the respective coding unit are selected from the channel-coded data.
  • the radio frame thus formed is then compensated and subjected to a first interleaving.
  • the radio frame is then segmented and subjected to rate adjustment.
  • the coding units are formed by the block redundancy selection in such a way that each redundancy version or coding unit of the same data packet always has the same number of bits. As a result, the subsequent processing blocks do not have to be adapted to different lengths of the coding units each time.
  • the coding of the headers in the right coding branch in FIG. 6 is carried out with function blocks similar to the coding of the data packets just described. However, several headers are first chained together before a common CRC checksum is added to these chained headers. This has the advantage that more effective CRC error protection is achieved.
  • the individual headers are only a few bits long.
  • the CRC checksum to be added in each case has a minimum length of 16 bits, for example. If one were to add a single checksum to each header, 16 checksum bits would have to be transmitted with each header. By concatenating multiple headers it is only required once per chain group 16
  • the Redundancy Selection block is omitted in the coding branch on the right, since no different coding units are generated by the headers.
  • the headers are channel-coded more strongly and thus more reliably in the right coding branch than the data packets in the left coding branch. It also becomes the first
  • Headers are therefore more interleaved than the data packets.
  • the headers are thus transmitted more securely overall than the data packets.
  • the top block in FIG. 6 indicates the generation of the HARQ headers and the control of the selection of the number of the coding units by the protocol layer 2 (L2).
  • the channel-coded data packets and headers are multiplexed onto a common logical transport channel TrCH.
  • TrCH logical transport channel
  • the data stream thus formed is then divided into individual physical transmission channels (this can be omitted in other exemplary embodiments) and a second interleaving is carried out within these channels.
  • the data is then transmitted to the receiver via the assigned physical channels.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Selon l'invention, au moins une partie d'information (SN) d'un en-tête (Header) d'un paquet de données (PDU, bloc de transport), est pourvue d'un code plus sûr, si l'on compare avec celui du paquet de données (PDU, bloc de transport), pour la transmission par l'intermédiaire d'une interface radio du système de communication radio.
PCT/DE2001/001427 2000-04-11 2001-04-11 Procede pour transmettre des paquets de donnees dans un systeme de communication radio WO2001078295A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU58214/01A AU5821401A (en) 2000-04-11 2001-04-11 Method for transmitting data packets in a radio communications system

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10017885.5 2000-04-11
DE10017885 2000-04-11
DE10025281A DE10025281A1 (de) 2000-04-11 2000-05-22 Verfahren zum Übertragen von Datenpaketen in einem Funk-Kommunikationssystem
DE10025281.8 2000-05-22

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WO2001078295A1 true WO2001078295A1 (fr) 2001-10-18

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2938141A1 (fr) * 2008-11-04 2010-05-07 Thales Sa Procede d'amelioration d'acquisition d'un ensemble de donnees emises de facon repetitive en environnement difficile

Citations (1)

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Publication number Priority date Publication date Assignee Title
US5818826A (en) * 1996-06-17 1998-10-06 International Business Machines Corporation Media access control protocols in a wireless communication network supporting multiple transmission rates

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
US5818826A (en) * 1996-06-17 1998-10-06 International Business Machines Corporation Media access control protocols in a wireless communication network supporting multiple transmission rates

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2938141A1 (fr) * 2008-11-04 2010-05-07 Thales Sa Procede d'amelioration d'acquisition d'un ensemble de donnees emises de facon repetitive en environnement difficile
WO2010052252A1 (fr) * 2008-11-04 2010-05-14 Thales Procede d'amelioration d'acquisition d'un ensemble de donnees emises de facon repetitive en environnement difficile
US20110209034A1 (en) * 2008-11-04 2011-08-25 Thales Method for Improving the Acquisition of a Data Set Transmitted Repeatedly in a Difficult Environment
US8812937B2 (en) 2008-11-04 2014-08-19 Thales Method for improving the acquisition of a data set transmitted repeatedly in a difficult environment

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