WO2007104261A1 - Procede et systeme de soutien de traitement en cascade par segmentation de retransmission de paquets - Google Patents

Procede et systeme de soutien de traitement en cascade par segmentation de retransmission de paquets Download PDF

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Publication number
WO2007104261A1
WO2007104261A1 PCT/CN2007/000838 CN2007000838W WO2007104261A1 WO 2007104261 A1 WO2007104261 A1 WO 2007104261A1 CN 2007000838 W CN2007000838 W CN 2007000838W WO 2007104261 A1 WO2007104261 A1 WO 2007104261A1
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WIPO (PCT)
Prior art keywords
data unit
unit
protocol data
service data
identifier
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PCT/CN2007/000838
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English (en)
Chinese (zh)
Inventor
Xiaoxiao Zheng
Fei Shao
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Huawei Technologies Co., Ltd.
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Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2007104261A1 publication Critical patent/WO2007104261A1/fr

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    • 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
    • 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

  • the present invention relates to mobile communication technologies, and more particularly to a method and system for supporting data packet retransmission and split cascading. Background of the invention
  • the PDU split cascading scheme for AM (acknowledgement mode) and its corresponding PDU header design are mainly as follows.
  • Method 1 Based on numbering the SDU, reuse this number for ARQ retransmission detection.
  • the data packet format in Method 1 is shown in Figure 1.
  • Method one is specifically as - 1.
  • the Type field indicates whether it is a control packet or a user packet.
  • the cascading is performed, and the packet header HI indicates the cascading information.
  • the HI includes the SN (that is, the sequence number of the SDU), F indicates whether it is the end of the SDU, and SD is the segmentation depth (that is, the re-segmentation cascade is performed several times) ), SSN is the subsequence of the cascading cascade each time.
  • the length of the SSN field is determined by the current SD, that is, the current splitting cascade is performed.
  • the SD can be configured by the upper layer to configure the highest number of re-segmentation cascades, and LI indicates the end of the SDU.
  • the status report needs to include the corresponding SN, SD, SSN to indicate which block needs to be retransmitted.
  • the above method 1 can realize the split cascading at the time of retransmission, the header of the packet is relatively large, and the overhead of the status report is relatively large, which is not conducive to the improvement of the transmission efficiency.
  • the packet format of method 2 is shown in Fig. 2A.
  • TSN indicates the first PDU sequence number of each SDU, so the TSN is not continuous.
  • the process of re-segmenting the cascade is shown in Figure 2B. As can be seen from Figure 2B, the re-segmentation cascade can only occur at the SDU boundary.
  • the disadvantages of Method 2 are: The restrictions on re-segmentation are more stringent and can only be done at the SDU boundary. If the TB (Transport Block) transmitted for the first time is part of an SDU, the cascading cannot be re-segmented. At the same time, the second method does not make the most use of the air interface.
  • the packet format of method three is shown in Figure 3.
  • the third method proposes that the flexibility of downlink scheduling should be very high. Therefore, there should be very few cases where the data of the initial segmentation is too large and cannot be transmitted during retransmission. Therefore, the re-segmentation cascade mechanism can be used only for uplink. For the re-segmentation cascading mechanism only twice, the packet header is marked with a special identifier to be a quadratic split packet, and the retransmission split cascading TSN can extend the TSN at the initial transmission.
  • the defect of the third method is similar to the second method, and the restriction on the re-segmentation cascade is large, which is not conducive to the full utilization of the air interface.
  • Method 4 is basically the same as Method 1, except that Method 4 can only support re-segmentation and does not support re-cascading.
  • the defects caused by this are: There are more headers and the status report that needs to be supported is correspondingly larger.
  • the method 4 only supports re-segmentation and does not support re-cascading. Therefore, Method 4 cannot fully utilize the air interface. ' Invention content
  • the embodiments of the present invention provide a method and system for supporting packet retransmission and split cascading, which reduces the overhead of the packet header and the status report size as much as possible, and simplifies the processing process, and provides the implementation of the MAC entity for the RLC function. A choice.
  • a method for supporting a data packet retransmission and split cascading includes: - numbering a data unit of an acknowledge mode service to obtain a sequence number, and the sequence number is extended to a subsequent process of the data unit
  • the data unit is a transmission unit or a unit that needs to be split and cascaded;
  • the header part of the transmitted transmission unit includes at least the serial number and the split concatenation information of each data block in the transmission unit, and the split concatenation information includes: a status identifier and a length identifier, where the status identifier indicates that the data block is The existing form of the transmission unit, the length identifier is a length indication field, and the status identifier and the length identifier are combined to indicate the positional relationship of the data block in the transmission unit, so that the peer receiving end can be correctly reorganized.
  • the embodiment of the present invention further provides a system for supporting a data packet retransmission and splitting cascade, comprising: a transmitting end and a receiving end, wherein the transmitting end is provided with a determining splitting cascaded information module and a sending module, and the receiving The terminal is provided with a receiving module and a recombining module;
  • Determining the split cascading information module determining, according to the existence form of the transport unit according to the split data block, and the length indication corresponding to the data block, determining the status identifier and the length identifier of each data block, and determining the number and location of the data unit
  • the status identifier and the length identifier are carried in the header portion of the transmission unit;
  • Transmitting module used to send the transmission unit
  • Receiving module for receiving a transmission unit transmitted by the sending module
  • the reassembly module is configured to reassemble the data blocks after the cascading according to the packet header information carried by the transmission unit received by the receiving module.
  • the embodiment of the present invention provides a split cascading scheme of an AM service for ARQ retransmission and a corresponding PDU and a status report (status PDU), and a support packet retransmission and split cascading according to an embodiment of the present invention is provided.
  • the method shares a sequence number in the process of split cascading, re-segment cascading, reassembly, and high-level encryption; the sequence number can be either a number for the SDU (Service Data Unit) or a target number.
  • the number of the PDU (Packet Data Unit) after the cascading is first divided, that is, the re-segmentation cascade, reorganization, and the like reuse the sequence number.
  • the packet header of the data packet needs to include a sequence number, split cascading information, a packet type indication, and the like.
  • the split concatenation information indicates which part of a certain PDU of a certain PDU is a SDU (or a re-segmented PDU) by using the D field and a special ELI.
  • a PDU contains multiple SDU partitions (or re-segmented PDU fragments)
  • it can be uniquely represented by SN, D domain, special corresponding ELI domain, and corresponding DATA.
  • embodiments of the present invention improve the deficiencies of the prior art, which have the following advantages:
  • a valid header format supports re-segment cascading when retransmitting.
  • FIG. 1 is a data packet format in a prior art split cascading method 1.
  • FIGS. 2A and 2B are schematic diagrams of a prior art split cascading method 2 and a data packet format thereof.
  • FIG. 3 is a data packet format in the prior art split cascading method 3.
  • FIG. 4 is a data packet format in the prior art split cascading method 4.
  • FIG. 5 is a format of a data packet numbered for an SDU according to an embodiment of the present invention.
  • FIG. 6 is a format of an initial data packet for numbering a PDU according to an embodiment of the present invention.
  • Figure 7 is a diagram of a retransmission packet format for numbering PDUs according to an embodiment of the present invention. Mode for carrying out the invention
  • An embodiment of the present invention provides a method for supporting a data packet retransmission and split cascading, which includes: numbering a data unit of an acknowledge mode service to obtain a sequence number, and the sequence number is extended to subsequent processing on the data unit.
  • the packet header portion of the transmitted data unit includes at least the sequence number and corresponding split concatenation information, the sequence number and the segmentation concatenation information collectively indicating a determined positional relationship of each data block in the data unit.
  • the data unit here may be a transmission of an i
  • the split cascading information is required for both retransmission and initial transmission; if it is the initial split cascading Pt) U number, the split level link is needed for re-segmenting the cascading data packets, so it is necessary to indicate each Whether the data packet is an initial transmission PDU or a retransmission PDU.
  • the split cascading information indicates which SDU of a certain PDU is by using a special length identifier ELI.
  • an SDU is packaged in four forms. Included in a PDU, mode 1, a complete SDU in a PDU; mode 2, the beginning of the SDU to a certain byte (the beginning of the SDU) in a PDU; mode 3, a byte of the SDU to the end of the SDU ( The SDU end fragment is in a PDU; mode four, a certain byte of the SDU to a certain byte of the SDU (the middle segment of the SDU) is in a PDU.
  • the two-bit status indicator D field is used to indicate the form in which the SDU exists in this PDU (one of the above four forms), and the special ELI length indication field and the D field are combined to reflect which part of the SDU this segment is. If the D field indicates that the fragment is a complete SDU, the ELI field indicates the location of the SDU at the end of the PDU or the length of the SDU; if the D field indicates that the fragment is from the beginning of an SDU to the end of a byte, the ELI The field indicates the total length of the SDU in the PDU, that is, the SDU end byte.
  • the ELI field indicates the SDU' start byte and the SDU end byte number. Or the end of the SDU is at the location of the PDU; if the D field indicates that the segment is an intermediate segment of an SDU, the ELI field indicates which byte the SDU starts with and which byte ends. ,
  • the above D domain + ELI domain representation method can be applied to the case of numbering the first divided cascaded PDUs, and the ELI indication field indicates which parts of the original PDU are fragmented when the cascade is again divided.
  • a PDU contains multiple SDU segments (or re-segmented PDU segments), it can be uniquely represented by SN, D domain, special corresponding ELI domain, and corresponding DATA.
  • the SDU is buffered in the retransmission buffer (if for each SDU number), or the first concatenated PDUs are concatenated (if the PDUs are concatenated for each initial split).
  • the corresponding update is performed.
  • For the SDU cache it may be confirmed that all the SDUs are correctly received by the peer entity, and then the entire SDU is deleted at one time, and the confirmed part may also be deleted. SDU deleted.
  • the cache for the PDU is similar to this and will not be described again.
  • the corresponding status report also needs to include split cascading information (ie, D domain and ELI domain): If the PDUs of the initial split cascading are numbered, the status report of the feedback after the initial transmission may only include the SN; if it is for the SDU, Then, whether the initial transmission or the retransmission needs to carry the SN (SDU sequence number), the D domain, and the ELI domain in the status report, the sender can find the corresponding segment through the information to perform re-segment cascading and retransmission.
  • split cascading information ie, D domain and ELI domain
  • header information for the foregoing description is only some identifiers necessary for the split cascading in the embodiment of the present invention.
  • the header of the data packet may also include other indication bits, such as whether the indication is a data packet or a control packet.
  • the next byte is data or header, etc., and is not shown here one by one.
  • Embodiment 1 If the SDUs are numbered, the packet format is as shown in Figure 5.
  • the SN in the packet header is the SDU sequence number corresponding to the data segment
  • D indicates the manner in which the SDU exists in the PDU
  • the combination of the D domain and the ELI domain specifically indicates which portions of the SDU the data segment contains.
  • D is a two-bit header field, which indicates the four existence modes of the SDU in the PDU. For example, 00 indicates that the data segment is a complete SDU, and ELI indicates that the SDU is at the end of the entire PDU (and LI in R6). Sample 01 indicates that the fragment is from the beginning of the SDU to a byte, ELI indicates the number of bytes; 10 indicates that the fragment is from a certain byte to the end of the SDU, and ELI indicates the number of bytes and the number of bytes at the end of the SDU 11 indicates that the fragment is from a certain byte of the SDU to a certain byte of data, and ELI indicates the two bytes.
  • D-01 is the SDU from the beginning to 500bit
  • ELI 500
  • D-10 that is, SDU from 300bit to the end
  • SDU is 800bit
  • ELI 300 800
  • ELI 300 700.
  • the retransmission buffer of the sending end may be buffered for the SDU, and the SDU is deleted until the received status report indicates that a complete SDU is correctly received by the receiving end; or the SDU divided fragment is cached, that is, the status report indication is received. If a segmented SDU segment is received correctly, the segment can be deleted.
  • split concatenation, sequence number allocation, and PDU header format are the same as those in the first embodiment, except that the status report is used.
  • the PDUs buffered in the retransmission buffer are partitioned PDUs, and each time the retransmission is performed to re-segment the PDUs, the cache is re-updated.
  • this embodiment numbers the PDUs, and the format of the first transmission data packet is as shown in FIG. 6.
  • the number of bytes at the end of the section and the initial PDU; D ll indicates that the fragment is a byte of the initial transmission PDU to a certain byte, and ELI is the corresponding two bytes.
  • the retransmission buffer of the sending end buffers the PDU after the initial transmission; after the retransmission occurs, the buffer may be a PDU, or the PDU may be re-segmented and concatenated, and each update is based on the weight. Depending on the content of the cache.
  • the SN and the packet header are the same as the third embodiment, and the status report is the same as the third embodiment in the initial retransmission, but the retransmission status report only needs to use the first PDU in the PDU.
  • SN, D, ELI indicate this retransmission PDU.
  • the PDU buffered in the retransmission buffer is the PDU that was originally transmitted.
  • embodiments of the present invention improve the deficiencies of the prior art, which have the following advantages -
  • a valid header format supports re-segment cascading when retransmitting.

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

Abstract

L'invention concerne un procédé et un système de soutien de traitement en cascade par segmentation de retransmission de paquets. Ce procédé comprend les étapes suivantes : l'unité de données d'un traffic en mode accusé de réception est numérotée afin d'obtenir un numéro de séquence, ce numéro sera utilisé pendant la procédure de traitement suivante de l'unité de donnée; la partie en-tête de paquet de l'unité de données transmise comprend au moins le numéro de séquence et des informations de traitement en cascade par segmentation correspondantes, le numéro de séquence et les informations de traitement en cascade indiquant ensemble le rapport d'emplacement exact de chaque bloc de données dans l'unité de données. Le procédé et le système selon l'invention soutiennent à nouveau un traitement en cascade par segmentation lorsqu'il y a retransmission, soutenant non seulement la numérotation de la SDU mais également de la PDU, ce qui permet de faire l'économie du rapport d'état.
PCT/CN2007/000838 2006-03-15 2007-03-15 Procede et systeme de soutien de traitement en cascade par segmentation de retransmission de paquets WO2007104261A1 (fr)

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