WO2010123306A2 - 송신 장치 및 재전송 방법 - Google Patents

송신 장치 및 재전송 방법 Download PDF

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Publication number
WO2010123306A2
WO2010123306A2 PCT/KR2010/002554 KR2010002554W WO2010123306A2 WO 2010123306 A2 WO2010123306 A2 WO 2010123306A2 KR 2010002554 W KR2010002554 W KR 2010002554W WO 2010123306 A2 WO2010123306 A2 WO 2010123306A2
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WIPO (PCT)
Prior art keywords
pdu
arq
field
extended header
block
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Ceased
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PCT/KR2010/002554
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English (en)
French (fr)
Korean (ko)
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WO2010123306A3 (ko
Inventor
차재선
임광재
장성철
윤철식
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Electronics and Telecommunications Research Institute ETRI
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Electronics and Telecommunications Research Institute ETRI
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Application filed by Electronics and Telecommunications Research Institute ETRI filed Critical Electronics and Telecommunications Research Institute ETRI
Priority to US13/265,966 priority Critical patent/US8713395B2/en
Priority to CN2010800283617A priority patent/CN102498686A/zh
Priority to JP2012507160A priority patent/JP2012525058A/ja
Priority to EP10767320.4A priority patent/EP2424150A4/en
Publication of WO2010123306A2 publication Critical patent/WO2010123306A2/ko
Publication of WO2010123306A3 publication Critical patent/WO2010123306A3/ko
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H04L1/12—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
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1664—Details of the supervisory signal the supervisory signal being transmitted together with payload signals; piggybacking
    • 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
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1864—ARQ related signaling
    • 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 a transmitting apparatus and a retransmission method, and more particularly, to an automatic repeat request (ARQ) retransmission method.
  • ARQ automatic repeat request
  • a wireless communication system uses a retransmission method of retransmitting a packet that has failed transmission, and there is an ARQ method as a retransmission method.
  • a service data unit SDU
  • PDU protocol data unit
  • Each PDU indicates the sequence number of the first ARQ block among the ARQ blocks belonging to the corresponding PDU so that the receiver can reassemble it.
  • Retransmission of PDUs includes re-arrangement of PDUs and transmission of the same PDU that failed to be retransmitted without reconfiguration.
  • the ARQ blocks included in the PDU to be retransmitted are divided into several PDUs.
  • the ARQ block size used in the initial transmission and retransmission is fixed, it may not be able to properly cope with the wireless environment. For example, if a 100-byte ARQ block fails, sending a smaller ARQ block can increase the probability of success, but if the size of the retransmitted ARQ block is limited by a previously determined size, the probability of success Have difficulty raising.
  • An object of the present invention is to provide a retransmission method and apparatus that can increase the retransmission success probability.
  • a method for retransmitting a PDU in a transmitting apparatus of a wireless communication system may include fragmenting at least one ARQ block included in a first PDU into a plurality of ARQ subblocks, allocating the plurality of ARQ subblocks to a payload of at least one second PDU. Allocating a first field indicating the sequence number of the first ARQ subblock belonging to the payload of the second PDU to the extension header of the 2 PDUs, and transmitting the second PDU.
  • the method may further include allocating a second field indicating whether the payload of the second PDU includes the last ARQ subblock to the extension header of the second PDU.
  • One of the second PDUs may be allocated to the payload of another second PDU.
  • the ARQ blocks may be fragmented into a fixed size to generate the plurality of ARQ subblocks.
  • a third field indicating whether the second PDU is a PDU reconfigured may be further allocated to the extension header of the second PDU.
  • Retransmission method fragmenting at least one ARQ block included in a first PDU into a plurality of ARQ subblocks, generating at least one second PDU from the plurality of ARQ subblocks And transmitting the second PDU.
  • the second PDU includes an extension header and a payload including an ARQ subblock of at least some of the plurality of ARQ subblocks.
  • the extension header includes a first field indicating whether the payload includes a last ARQ subblock.
  • the extended header may further include a second field indicating a sequence number of the first ARQ subblock belonging to the payload.
  • the extended header may further include a third field indicating whether the second PDU is a PDU reconstructed.
  • a transmitting apparatus of a wireless communication system which includes a cutting unit, a PDU generating unit and a transmitting and receiving unit.
  • the cutting part divider fragments at least one ARQ block included in a first PDU into a plurality of ARQ subblocks, and allocates the plurality of ARQ subblocks to a payload of at least one second PDU.
  • the PDU generator assigns an extension header including a field indicating whether its payload includes the last ARQ subblock to the second PDU.
  • the transceiver unit transmits the second PDU.
  • the PDU generation unit of the transmitting apparatus of the wireless communication system allocates an extension header including a field indicating a sequence number of the first ARQ subblock belonging to its payload, to the second PDU.
  • the retransmission efficiency can be increased.
  • one extended header is used for all SDUs or SDU fragments belonging to a PDU instead of one extended header for each SDU, overhead caused by the extended header can be reduced.
  • FIG. 1 is a schematic block diagram of a retransmission apparatus according to an embodiment of the present invention.
  • FIG. 2 is a diagram illustrating a PDU reconfiguration method according to an embodiment of the present invention.
  • 3, 7, 12, and 13 are diagrams illustrating extended headers of a PDU according to an embodiment of the present invention, respectively.
  • FIG. 4 shows an example of a PDU reconfiguration according to FIG. 3.
  • 5 and 6 show an example of an extended header of the reconstruction PDU shown in FIG. 4.
  • FIG. 7 is a diagram illustrating an extension header of a PDU according to an embodiment of the present invention.
  • FIG. 8 is a diagram illustrating each extended header block of FIG. 7.
  • FIG. 9 shows an example of a PDU reconfiguration according to FIG. 7.
  • FIG. 13 is a diagram illustrating each extended header block of FIG. 12.
  • FIG. 15 is a diagram illustrating each extended header block of FIG. 14.
  • the terminal may be a mobile station (MS), a mobile terminal (MT), a subscriber station (SS), a portable subscriber station (PSS), a user equipment (UE), an access terminal (access terminal, AT) and the like, and may include all or part of the functions of the mobile station, MT, SS, PSS, UE, AT and the like.
  • MS mobile station
  • MT mobile terminal
  • SS subscriber station
  • PSS portable subscriber station
  • UE user equipment
  • AT access terminal
  • the base station may be an access point (AP), a radio access station (RAS), a node B (node B), an advanced node B (evolved node B, eNodeB), a base transceiver station ( It may refer to a base transceiver station (BTS), a mobile multihop relay (MMR) -BS, and the like, and may include all or a part of functions of an AP, RAS, NodeB, eNodeB, BTS, MMR-BS, and the like.
  • AP access point
  • RAS radio access station
  • node B node B
  • eNodeB advanced node B
  • eNodeB evolved node B
  • BTS base transceiver station
  • MMR mobile multihop relay
  • FIG. 1 is a schematic block diagram of a transmitting apparatus according to an embodiment of the present invention
  • FIG. 2 is a diagram illustrating a PDU reconfiguration method according to an embodiment of the present invention.
  • the transmitting apparatus 100 includes a fragmentation / packing unit 110, a PDU generation unit 120, a transmission / reception unit 130, and a cutting unit 140.
  • the transmitting device 100 is formed on the transmitting side, and in the case of downlink, the transmitting side may be a base station, and in the case of uplink, the transmitting side may be a terminal.
  • the fragmentation / packing unit 110 fragments or packs the plurality of SDUs 210 and 220 according to the size of available resources for initial transmission, or the PDUs 230 and 240 without fragmentation / packing.
  • Payloads 231 and 241 are generated.
  • the size of the ARQ block is not fixed and can be changed.
  • the payloads 231, 241 of each PDU 230, 240 include at least one SDU or SDU fragment.
  • the PDU generation unit 120 inserts extension headers 232 and 242 including information on SDUs or SDU fragments belonging to the corresponding PDUs 230 and 240 into the PDUs 230 and 240, respectively. Arrange the.
  • the transceiver 130 transmits the PDUs 230 and 240 to the receiver.
  • the trimming unit 140 receives the payload 241 of the PDU 240 that fails to transmit, that is, the ARQ. Fragment the block into ARQ subblocks to generate payloads 251, 261 of PDUs 250, 260. Accordingly, the payloads 251, 261 of each PDU 250, 260 include at least one SDU or SDU fragment, that is, at least one ARQ subblock. In this case, the size of the ARQ subblock is different from the ARQ block, and all ARQ subblocks may have the same size.
  • the PDU generation unit 120 inserts, in each PDU 250, 260, extension headers 252, 262 including information of all SDUs or SDU fragments belonging to the corresponding PDUs 250, 260 into the PDUs 250, 260.
  • the transceiver 130 retransmits the reconfigured PDUs 250 and 260 to the receiver.
  • the PDU generation unit 120 further adds medium access control (MAC) headers 233, 243, 253, and 263 including information on the corresponding PDU to each PDU 230, 240, 250, and 260. Insert it.
  • MAC medium access control
  • the fragmentation that is, the size of the fragmenting block is changed into blocks of different sizes during retransmission
  • the retransmission efficiency can be improved.
  • one extended header is used for all SDUs or SDU fragments belonging to a PDU instead of one extended header for each SDU, overhead caused by the extended header can be reduced.
  • FIG. 3 is a diagram illustrating an extension header of a PDU according to an embodiment of the present invention.
  • the extended header includes a retransmission indicator (RI) field, a last sub-block indicator (LSI) field, and a sub-sequence number (SSN) field. It can be used to retransmit a PDU composed of SDUs received from one connection.
  • RI retransmission indicator
  • LSI last sub-block indicator
  • SSN sub-sequence number
  • FPEH fragmentation and packing extended header
  • the RI field indicates whether the current PDU is a PDU that is initially transmitted or a PDU that is retransmitted (ie, reconfigured). For example, if the value of the RI field is '1', it may represent that the current PDU is a retransmission (reconfiguration) PDU, and if it is '0', it may represent that the current PDU is a PDU to which the current PDU is initially transmitted (ie, not reconfigured).
  • the LSI field indicates whether the last ARQ subblock for the ARQ block of the first transmitted PDU is included in the current PDU. For example, if the value of the LSI field is '1', it may represent that the last ARQ subblock is included in the current PDU, and if it is '0', it may represent that the last ARQ subblock is not included in the current PDU.
  • the SSN field indicates the sequence number of the first ARQ subblock of the current PDU.
  • the RI field, the LSI field, and the SSN field of the extension header may indicate whether the current PDU is a reconstruction PDU and which ARQ subblock is included in the current PDU.
  • the extended header includes a sequence number (SN) field, a fragmentation control (FC) field, an end (END) field, and a length (Length) in addition to the RI field, the LSI field, and the SSN field. May contain fields.
  • the SN field indicates the sequence number of the first transmitted PDU, that is, the ARQ block.
  • the FC field represents fragmentation information of the SDU included in the initially transmitted PDU, and may be defined as shown in Table 1, for example.
  • the first byte of data in the PDU payload is the first byte of the SDU, and the last byte of data in the PDU payload is the last byte of the SDU. At least one unfragmented SDU is included in the PDU 01
  • the first byte of data in the PDU payload is the first byte of the SDU, and the last byte of data in the PDU payload is not the last byte of the SDU.
  • the PDU has only the first fragment of the SDU, the PDU has at least one unfragmented SDU and the first fragment of the SDU that is contiguous 10
  • the first byte of data in the PDU payload is not the first byte of the SDU, and the last byte of data in the PDU payload is the last byte of the SDU.
  • the PDU has only the last fragment of the SDU, the PDU has the last fragment of the SDU, and at least one subsequent unfragmented SDU 11
  • the first byte of data in the PDU payload is not the first byte of the SDU, and the last byte of data in the PDU payload is not the last byte of the SDU.
  • the PDU has only the middle fragment of the SDU, the PDU has the last fragment of the SDU, followed by zero or more unfragmented SDUs, and the first fragment of the SDU
  • the END field indicates whether there is a length field next, and if there is no next length field, the bit after the end field is filled with zeros until byte alignment. For example, if a value of the end field is '0', it indicates that there is a next length field and an end field, and if it is '1', it may indicate that there is no next length field. That is, if the value of the end field is '1', a reserved (Rsvd) field filled with zero may be located after the end field so that the length of the extension header may be aligned instead of the length field.
  • the Length field indicates the length of an ARQ subblock belonging to one SDU or SDU fragment. If there are N SDUs or SDU fragments in one PDU, the extended header may include (N-1) length fields.
  • numbers shown in parentheses in each field name represent an example of the number of bits allocated to each field.
  • the PDU may further include a MAC header in addition to the extension header of FIG. 3, and may further include other extension headers. If the PDU includes at least one other extension header, this information can be recorded in the MAC header and the extension header of FIG. 3 can be placed after the last other extension header. If the MAC header does not indicate that at least one other extension header is included in the PDU, the extension header of FIG. 3 may be located after the MAC header. In this way, since the extended header of FIG. 3 does not need to include the type of the extended header and an indication that the extended header is the last extended header included in the current PDU, the header of the extended header can be reduced.
  • FIG. 4 shows an example of a PDU reconfiguration according to FIG. 3, and FIGS. 5 and 6 show an example of an extension header of the reconfiguration PDU shown in FIG. 4.
  • the fragmentation / packing unit 110 receives an SDU # 1 having a length of 105 and an SDU # 2 having a length of 60 from one ARQ connection, and fragments the SDU # 1 into an SDU # 1 fragment having a length of 60. Generate payload of PDU # 1, and generate payload of PDU # 2 from SDU # 1 fragment of length 45 and SDU # 2.
  • the PDU generating unit 120 configures PDU # 1 by attaching an extended header whose value of the SN field is '1', and configures PDU # 2 by attaching an extended header whose value of the SN field is '2'.
  • the transceiver 130 transmits PDUs # 1 and # 2, respectively.
  • the trimming unit 140 may set the ARQ block of the PDU # 2, that is, the SDU # 1 fragment of length 45 and the SDU # 2 of 20 length. Fragment back to the ARQ subblock, generate a payload of new PDU # 3 with the first three ARQ subblocks, and generate a new PDU # 4 with the remaining three ARQ subblocks.
  • the PDU generating unit 120 attaches an extended header to configure PDUs # 3 and # 4.
  • the PDU generator 120 reconfigures PDU # 2 that failed to be transmitted into PDUs # 3 and # 4, and the transceiver 130 retransmits the ARQ block of PDU # 2 through the transmission of PDUs # 3 and # 4. do.
  • the payload of PDU # 3 having three ARQ subblocks is divided into the entire SDU # 1 fragment and the SDU # 2. It contains the first fragment, and the payload of PDU # 4 contains the second fragment of SDU # 2.
  • the RI field has a value of '1'
  • the SN field has a value of '2'
  • the FC field has a value of '10'
  • the LSI field Is the value '0'
  • the SSN field is the value '1'
  • the first end field is the value '0'
  • the first length field is the value '15'
  • the second end field is '1' With the value of, the subsequent bits are filled with zeros.
  • the RI field has a value of '1'
  • the SN field has a value of '2'
  • the FC field has a value of '10'
  • the LSI field has a value of ' A value of '1'
  • an SSN field has a value of '4'
  • a first termination field has a value of '1'
  • subsequent bits are filled with zeros.
  • FIG. 7 is a diagram illustrating extended headers of a PDU according to an embodiment of the present invention
  • FIG. 8 is a diagram illustrating each extended header block of FIG. 7.
  • an extended header is an extended header used for a PDU composed of SDUs received from a plurality of connections, and includes a plurality of extended header blocks (MEHB1-MEHBn).
  • Such an extended header may be referred to as a multiplexing extended header (MEH), and the extended header block may be referred to as a multiplexing extended header block (MEHB).
  • Each extended header block (MEHB1-MEHBn) contains information of SDUs or SDU fragments received from the same connection, and the number of extended header blocks (MEHB1-MEHBn) is equal to the number of connections to which the SDU or SDU fragment of the current PDU belongs. Do.
  • the extended header may include a last (L) field indicating whether the corresponding extended header is the last extended header included in the PDU and a type field indicating the type of the extended header.
  • the extension header may further include a reserved field for byte alignment.
  • each extended header block includes an RI field, an LSI field, and an SSN field in the same manner as the extended header of FIG. 3, and further includes an M field and a flow identifier (FlowID) field.
  • FlowID flow identifier
  • the M field indicates whether another extended header block exists after the current extended header block. For example, if the value of the M field is '1', the current extended header block is the last extended header block belonging to the extended header. Indicates that the next extended header block is present.
  • the FlowID field indicates an identifier of a radio connection associated with an SDU or an SDU fragment included in a current extension header block.
  • the first extension header block of the extension header may not include the FlowID field.
  • the flow identifier of the first extended header block may be regarded as the same value as the flow identifier set in the MAC header of the PDU.
  • each extended header block may further include an FC field, an SN field, a length indicator (LI) field, and a length field.
  • the FC field indicates how the SDU or SDU fragment included in the corresponding extended header block is fragmented or packed, and has the same value as the extended header block included in the initially transmitted PDU.
  • the FC field may be defined as shown in Table 1 described above, for example.
  • the SN field indicates the sequence number of the first transmitted PDU.
  • the LI field indicates whether there is a length field next. For example, if the value of the LI field is '0', it may indicate that there is a length field next, and if it is '1', it may indicate that there is no length field next and there is a field for byte alignment (reservation field).
  • the length field indicates the length of an ARQ subblock belonging to the same SDU.
  • the length of the first SDU or SDU fragment included in the first extended header block is not included in the extended header block.
  • the length of the first SDU or the SDU fragment may be calculated by subtracting the total length of the extended header and the sum of the values of the length fields included in the remaining extended header blocks from the total length of the PDU included in the MAC header. If the value of the LI field before the length field is '1', a reserved field filled with zero may be located after the LI field so that the length of the entire extended header block may be aligned instead of the length field.
  • the PDU generating unit 120 configures PDU # 1 by attaching an extended header whose value of the SN field is '1', and configures PDU # 2 by attaching an extended header having '2' and '1' as the value of the SN field. do.
  • the transceiver 130 transmits PDUs # 1 and # 2, respectively.
  • the trimming unit 140 fragments the SDU # 1 fragment of length 45 and the SDU # 2 into an ARQ subblock having a length of 20, respectively.
  • the first four ARQ subblocks generate payload of new PDU # 3 and the other two ARQ subblocks generate new PDU # 4.
  • the PDU generating unit 120 attaches an extended header to configure PDUs # 3 and # 4. That is, the PDU generator 120 reconfigures PDU # 2 that failed to be transmitted into PDUs # 3 and # 4, and the transceiver 130 retransmits the ARQ block of PDU # 2 through the transmission of PDUs # 3 and # 4. do. If the length of the ARQ subblock is 20, the payload of PDU # 3 contains the entire SDU # 1 fragment and the first fragment of SDU # 2, and the payload of PDU # 4 contains the second fragment of SDU # 2. can do.
  • the value of the L field is '1'
  • the extended header is an extended header block for ARQ connection of FlowID # 1 and an extended header for ARQ connection of FlowID # 1.
  • the M field has a value of '0'
  • the RI field has a value of '1'
  • the FC field has a value of '10'
  • the SN field has a value of '2'
  • the LSI field has a value of ' A value of '1'
  • an SSN field has a value of '1'
  • an LI field has a value of '1'
  • a first length field that is, a reserved field, is filled with zeros.
  • the extension header of PDU # 4 is configured in the form of an extension header (FPEH) described with reference to FIG. Therefore, as shown in FIG. 11, in the extended header of PDU # 4, the RI field has a value of '1', the FC field has a value of '00', the SN field has a value of '1', and the LSI field has a value of ' A value of '1', an SSN field has a value of '2', an end field has a value of '1', and subsequent bits are filled with zeros.
  • FPEH extension header
  • FIG. 12 is a diagram illustrating an extension header of a PDU according to an embodiment of the present invention
  • FIG. 13 is a diagram illustrating each extension header block of FIG. 12.
  • the extended header includes an L field and a type field, and has a plurality of extended header blocks ARIB1 -ARIBn respectively corresponding to a plurality of connections.
  • Such an extended header may be referred to as an ARQ retransmission information block, and an extended header block may be referred to as an ARQ retransmission information block (ARIB).
  • each ARIB includes an M field, an LSI field, and an SSN field.
  • the L field, the type field, the M field, the LSI field, and the SSN field may be defined as described with reference to FIGS. 3 to 11.
  • extension header for one connection and an extension header for multiple connections may be represented by one extension header. Such an embodiment will be described with reference to FIGS. 13 and 14.
  • FIG. 14 is a diagram illustrating extended headers of a PDU according to one embodiment of the present invention
  • FIG. 15 is a diagram illustrating each extended header block of FIG. 14.
  • the extended header includes at least one extended header block FPMEHB1-FPMEHBn respectively corresponding to at least one connection, and includes the extended header described with reference to FIG. 3 and the extended header described with reference to FIG. 7. Corresponds to the integrated form.
  • extended headers may be referred to as fragmentation, packing and multiplexing extended headers (FPMEH), and extended header blocks may be referred to as fragmentation, packing and multiplexing extended header blocks (FPMEHB). It can be said.
  • each extended header block may have the same structure as the extended header block described with reference to FIG. 8.
  • the extended header does not include the L field and the type field. If the MAC header indicates that the PDU includes at least one other extension header instead, the extension header of FIG. 14 may be located after the last other extension header. If the MAC header does not indicate that at least one other extension header is included in the PDU, the extension header of FIG. 14 may be located immediately after the MAC header.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Communication Control (AREA)
PCT/KR2010/002554 2009-04-24 2010-04-23 송신 장치 및 재전송 방법 Ceased WO2010123306A2 (ko)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US13/265,966 US8713395B2 (en) 2009-04-24 2010-04-23 Transmitting apparatus and retransmitting method
CN2010800283617A CN102498686A (zh) 2009-04-24 2010-04-23 传送装置和转发方法
JP2012507160A JP2012525058A (ja) 2009-04-24 2010-04-23 送信装置および再送方法
EP10767320.4A EP2424150A4 (en) 2009-04-24 2010-04-23 TRANSMISSION DEVICE AND TRANSMISSION METHOD

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KR20090036115 2009-04-24
KR10-2009-0036115 2009-04-24
KR10-2010-0037734 2010-04-23
KR1020100037734A KR20100117531A (ko) 2009-04-24 2010-04-23 송신 장치 및 재전송 방법

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