WO2008052483A1 - Procédé et appareil de compression de données et système de rétroaction de demande automatique de répétition - Google Patents

Procédé et appareil de compression de données et système de rétroaction de demande automatique de répétition Download PDF

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Publication number
WO2008052483A1
WO2008052483A1 PCT/CN2007/070998 CN2007070998W WO2008052483A1 WO 2008052483 A1 WO2008052483 A1 WO 2008052483A1 CN 2007070998 W CN2007070998 W CN 2007070998W WO 2008052483 A1 WO2008052483 A1 WO 2008052483A1
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WO
WIPO (PCT)
Prior art keywords
compressed
packet
data
check result
error
Prior art date
Application number
PCT/CN2007/070998
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English (en)
Chinese (zh)
Inventor
Yi Bao
Original Assignee
Huawei Technologies Co., Ltd.
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
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2008052483A1 publication Critical patent/WO2008052483A1/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
    • H04L1/12—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
    • H04L1/1614—Details of the supervisory signal using bitmaps

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a data compression method, apparatus, and automatic request retransmission feedback system. Background technique
  • ARQ Automatic Repeat Request
  • FIG. 1 is a schematic diagram showing the working principle of the simplified ARQ mechanism in the prior art.
  • the transmitting end 101 sends the numbered data packet to the receiving end 102, and after receiving the data packet, the receiving end feeds back the error check result to the transmitting end.
  • the two check results are described.
  • the error check result ACK fed back by the receiving end indicates that the data packet with sequence number 1 is correct; for the second feedback 104, the feedback of the feedback at the receiving end is correct.
  • the result NAK indicates that the packet with sequence number 2 is in error and the sender 101 should resend.
  • the implementation of the ARQ mechanism mainly involves error detection of the data packet and feedback of the error test result to the transmitting end. If the number of data packets is very large, the error check result will be directly fed back to the sender without any processing, and the system resources will be excessively occupied, and the feedback overhead is too large.
  • the method compresses the error correction result into a response message, and the response message includes at least one error packet sequence number SN. And at least one field L for indicating the number of consecutive erroneous data packets after the erroneous data packet; wherein, the data packet sequence The number of occupied bits is 12, and the number of occupied bits in the field L is 4.
  • the content of the feedback response message obtained by the compression method is as shown in FIG. 2.
  • SN LENGTH indicates the error packet sequence number
  • L LENGTH indicates how many packets are in error after the corresponding sequence number packet
  • LENGTH indicates how many pairs are present.
  • SN LENGTH and L LENGTH for example, if SN corpse 5, L corpse 10 indicates that packet number 5 is in error, and there are 10 packet errors after packet number 5.
  • Bitmap information (Bitmap) compression method This method compresses the error check result into a response message, which contains the bitmap information and the sequence number of the packet corresponding to the first bit of the bitmap information.
  • the response message obtained by the method includes the following parts: LENGTH, wherein LENGTH plus 1 can obtain the number of bytes of the bitmap; FSN represents the packet number corresponding to the first bit of the Bitmap, and FSN plus bit_position can be The other packet sequence numbers are obtained.
  • the bit_position refers to the offset of the first bit from the bit distance in the Bitmap.
  • the bit_position value is a continuous natural number starting from zero.
  • the bitmap corresponds to the bit value of 0 or 1 value, indicating that the bit corresponds to the bit. Packet error (NAK) or correct (ACK).
  • the bit_positon of the first bit in Bitma is 0, indicating that the data packet with the sequence number FSN, for example, the bit number corresponding to the bit with bit_positon 4 is FSN plus 4, and the value of this bit in Bitma is 1, indicating that the data packet is correct.
  • ACK the same as the data packet with the sequence number FSN plus 6 corresponds to a bit value of 0 in the Bitmap, indicating that the data packet is not correctly received, that is, NAK;
  • Rlist compression method The error verification result is compressed into a sequence number FSN containing an error packet, and a response message of the field CW (Code Word); wherein, CW represents the next error packet included in the response message The length of the error packet; this method can be understood as the compression of the bitmap information in the bitmap method.
  • LENGTH represents the number of fields CW, and each CW occupies 4 bits.
  • Table 1 For each CW meaning, see Table 1:
  • CW 2 is 1100
  • CW 3 is 1101
  • the last bit is 0, it means that the first three bits 110 and the first three bits 101 of CW 2 are the same number, and 110 is Low, 101 is high, .
  • ⁇ and cw 2 combined to get the number 101110 the same figure can be obtained from CW to CW 3 is 101110110, 101110110 represents decimal 374, which means that the next error packet is the data packet contained in this response. After the 374th;
  • This method compresses the data by means of field combination, which occupies less system overhead, but the implementation mechanism is complicated and difficult to implement.
  • the third method Rlist is a first method
  • the object of the embodiments of the present invention is to provide a data compression method, a device, and an automatic request retransmission feedback system, which can achieve good data compression and simple implementation.
  • the present invention provides a data compression method for compressing an automatic request retransmission error check result, including:
  • bit number of the data packet identification field having the same error check result where k is any non-zero natural number, and n is an integer multiple of k;
  • the determined value m is represented by the n bits, and the m is the compressed data identifier field value.
  • the present invention provides a data compression apparatus for compressing an automatic request retransmission error check result, the apparatus comprising:
  • a saving unit configured to save an error check result to be compressed
  • a statistical unit configured to sequentially count the number of data packets consecutively having the same error check result in the error check result to be compressed
  • An identifier field obtaining unit configured to obtain a data packet identifier field that identifies consecutive consecutive error check results; when obtaining a data packet number identifier field, according to
  • the number of packets having the same error check result identifies the bit of the field, where the ⁇
  • the value is an integer multiple of k, and k is an arbitrary non-zero natural number; depending on the number of packets
  • m m + J 2* , using the n bits to represent the determined value m, m is the compressed packet number identification field.
  • the present invention also provides an automatic request retransmission feedback system, comprising: a data transmitting end, a data receiving end, a data verifying device, and a data compression device;
  • the data verification device is configured to perform error check on the data packet received by the data receiving end, and send the error check result arranged in the order of the data packet sequence number to the data compression device;
  • the data compression device is configured to count the number of data packets consecutively having the same error check result after the first error data packet in the error check result to be compressed, and obtain an error indication field that identifies an error check result to be compressed and Determining a bit n for identifying a packet number identification field having consecutive identical error check results, and using the n bits to represent the determined value m, the m being a compressed packet number identification field value, The sequence number of the first error packet and the number of compressed packet identification fields are used to feed back to the data sender to determine the packet that needs to be retransmitted.
  • the packet check result having the same error check result is identified by using less than the number of consecutive consecutive error check result packet numbers, so that after compression
  • the result of the ARQ error check occupies less bits, reduces system overhead, and the method and device of the present invention are simple and easy to implement.
  • FIG. 1 is a schematic diagram of a working principle of a simplified ARQ mechanism in the prior art
  • FIG. 2 is a structural diagram of compressed data obtained by using a List compression method in the prior art
  • FIG. 3 is a structural diagram of compressed data obtained by using a Bitmap compression method in the prior art
  • 4 is a structural diagram of compressed data obtained by using the Rlist compression method in the prior art
  • FIG. 5 is a flowchart of a method for compressing an ARQ error check result according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of a device composition for compressing an ARQ error check result according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of an ARQ feedback system according to an embodiment of the present invention. detailed description
  • An embodiment of the present invention provides a method for compressing an ARQ error check result. As shown in FIG. 5, the method includes:
  • Step 501 sequentially count the number of data packets consecutively having the same error check result in the error check result to be compressed
  • the error check result is arranged in the order of the corresponding data packet sequence number.
  • the error check result in the embodiment is represented by 0 for NAK, and 1 for ACK, which can also be used in other embodiments of the present invention.
  • 0 means NAK
  • 1 means ACK, and does not affect the implementation of the present invention;
  • Step 502 The number of data packets is satisfied: 2 ft ⁇ the number of data packets ⁇ 2 ⁇ 2, and the value of ⁇ is determined;
  • n is an integer multiple of k, and n is a bit for identifying a number of packet identification fields consecutively having the same error check result;
  • the value m, m is the value of the identification number field of the packet obtained after the final encoding, and is a binary number
  • n bits constitute a compressed number of data packet identification field, and the data packet number identification field is used to identify consecutive error check results;
  • the method solves the problem that the number of occupied data bits of the data packet identification method obtained by the prior art data compression method is too large; In order to achieve a better compression effect, the method further comprises:
  • n 2 ⁇ (n) - 1 ⁇ number of packets ⁇ 2 ⁇ (n+1 ) - 2, determining the value of n according to the formula; providing n bits for identifying the number of data packets; wherein, the n The value is an integer multiple of k, and k is an arbitrary non-zero natural number;
  • the number of data packet identification fields obtained according to the above method is: 1010; and the List method first uses 4 bits 1111 to represent 15 data packet numbers, and then The remaining 10 data packets are represented by 4 bits 1010; the number of data packet identification fields obtained by the Rlist method is: 01100011;
  • step 501 Assuming that there are 8 consecutive error packets in step 501, then based on:
  • the step 501 only needs to sequentially count the number of data packets consecutively having the same error check result after the first error data packet in the error check result to be compressed;
  • the error check result to be compressed is 1 1 1 0 1 1 1 1 1 0 0 1 0 1 , where the first error packet sequence number is assumed to be 100, then 4 consecutive packets are correct after the 100th packet. Packet, 2 consecutive erroneous packets, 1 correct packet, 1 erroneous packet, then the statistical result is 4 ( ACK ), 2 ( NAK ), 1 ( ACK ), 1 ( NAK );
  • the above method only solves the problem that the number of data packet identification fields in the List and Rlist methods occupies too many bytes.
  • the Bitma field used in the Bitmap method is used to identify the result and sequence of the packet verification, the number of occupied bits is too large. Compressing the Bitmap field into a packet error indication field containing a result of consecutively having the same error check result, and a packet number identification field;
  • the method for compressing the ARQ error check result further includes: Step 504: Identify the data packet with the same error check result by using less than the number of consecutive consecutive error check result data packets. a result of the verification, wherein the bit sequence constitutes an error indication field of the compressed data;
  • the error indication field obtained according to step 504 can be separately For the following form:
  • code 4 consecutive correct, code is 01, error indication bit is 11; 3 consecutive errors, code is 00, error indication bit is 00; 2 consecutively correct, code is 1 , error indication is 1; 1 error, code is 0, the indication is 0.
  • the error indication field is 110010.
  • the error indication field and the consecutive number of data packet identification fields having the same error check result constitute compressed data
  • an error indication field may be first placed, followed by a number of data packet identification fields having the same error check result, or may be consecutively provided with an error check result.
  • the number of packets identification field may also be transmitted first all error indication fields, and then the number of packets having the same error check result is continuously transmitted, or vice versa, four ways are possible, and the method is used by the technician. System conditions are selected;
  • bit n/k, the bit sequence sequentially forming an error indication field of the compressed data; wherein, n/ The value of k is an integer; n is based on ⁇ ; 2 ⁇ the number of packets ⁇ 2 ⁇ 2' 3 ⁇ 4 , k is an arbitrary non-zero natural number. '° ° '- °
  • the sender must know the serial number of the error packet from the feedback information before retransmitting the data packet.
  • the method steps provided in the above embodiments of the present invention do not involve recording.
  • the step of the packet serial number because:
  • the actual ARQ mechanism does not Only one type of data-specific compression method is used.
  • two or more compression methods coexist.
  • the existing List method and Rlist method are used. Therefore, the compression results sent back to the transmission can be combined in many different combinations.
  • the form, the combination form is as described in the prior art; when the data verification result obtained by the method provided by the embodiment of the present invention is not the first feedback in the entire ARQ, the error is solved by the above method.
  • the result of the verification can be compressed, because the sender can obtain the information about the sequence number of the packet from the error check result obtained by other compression methods; however, if the error verification result obtained by the method provided by the embodiment of the present invention is The first feedback, the method provided by the embodiment of the present invention further includes the following steps: recording the sequence number of the first error data packet in the error check result;
  • the reason for adding this step is: The sender can determine the sequence number of other error packets according to the serial number;
  • the compressed data obtained by the embodiment of the present invention is the first feedback
  • the first error packet sequence number in the error correction result to be compressed is further required.
  • Pre-configure k l, when the packet sequence length is 12 bits, the embodiment of the present invention is used.
  • the provided steps 501 to 504 are available:
  • FIG. 6 is a schematic diagram showing the composition of an apparatus for compressing an ARQ error check result according to an embodiment of the present invention, where the apparatus includes: a storage unit 601, a statistical unit 602, and an identifier field obtaining unit 603;
  • the saving unit is configured to save an error check result to be compressed, where the error check result is arranged in the order of the corresponding data packet sequence number;
  • the statistic unit 602 is configured to sequentially count the number of data packets consecutively having the same error check result in the error check result to be compressed;
  • the error check result to be compressed is 01110010, assuming that the first error packet sequence number is 6, and the statistical result obtained by the statistics unit 602 is: 3 consecutive correct packets after the 4th packet, 2 One consecutive error packet, one correct data packet, one wrong data packet, and the statistical result is ranked in order of 3 (ACK), 2 (NAK), 1 (ACK), 1 (NAK);
  • the identifier field obtaining unit is configured to obtain a data packet number identification field that continuously has the same error check result; when the data packet number identifier field is obtained,
  • the device further includes: an error indication field obtaining unit 604, in order to solve the problem that the Bitmap occupies too many bits in the Bitmap method;
  • the error indication field obtaining unit 604 is configured to obtain an error indication field that identifies a packet verification result that has consecutive identical error check results; the error indication field bit is less than the consecutive data having the same error check result.
  • the number of packets, the bit sequence constitutes a compressed error indication field;
  • the statistical unit 602 mentioned above the statistical result is obtained, and the error indication field obtained by the error indication field obtaining unit includes:
  • the first two bits of the field represent three consecutive correct packet check results; when the ARQ system only uses the device provided by the embodiment of the present invention or the device provided by the embodiment of the present invention, the compression result is ARQ a packet requiring feedback, then the device further comprises: a recording unit 605;
  • the recording unit is configured to record a serial number of the first error packet in the error check result to be compressed
  • the sequence number of the first erroneous data packet, the error indication field, and the packet number identification field consecutively having the same error check result constitute a compressed data packet.
  • the device further includes: a coefficient saving unit 606, configured to save a pre-configured inequality
  • the inequality is derived as inequality 2 ⁇ ( n ) - 1 ⁇ number of packets ⁇ 2 ⁇ ( n+1 ) -2 , and the value of n is determined according to the formula; n bits are provided for Identifying the number of data packets consecutively having the same error check result;
  • FIG. 7 is a schematic diagram of a composition of an ARQ feedback system according to an embodiment of the present invention.
  • the system uses the data compression apparatus provided by the embodiment of the present invention, where the system includes: a data sending apparatus 701, a data receiving apparatus 702, and a data verifying apparatus. 703, data compression device 704;
  • the data sending device is configured to send a data packet to the data receiving device through the forward data channel;
  • the data receiving device is configured to receive a data packet sent by the data sending device, and the data verifying device is configured to perform error checking on the data packet received by the data receiving device, and according to the data packet serial number The sequentially arranged error check results are sent to the data compression device;
  • the data compression device is configured to count the number of data packets consecutively having the same error check result after the first error data packet in the error check result to be compressed, and obtain an error indication field that identifies an error check result to be compressed. And a packet number identification field for marking a consecutive identical error check result; wherein, the error indication field bit is less than the number of consecutive consecutive error check result packets, and the bit sequence constitutes a compressed Error nlk
  • Indicating field when obtaining the number of packets identification field, determining the value of n according to 2' 3 ⁇ 4 ⁇ number of packets ⁇ 2 ⁇ ⁇ 2; providing n bits for identifying the data having consecutive identical error check results
  • the data compression device is disposed at the data receiving end, and the compressed data packet number identification field and the serial number of the first error data packet are used for feedback to the data transmitting end, so that The sender determines the packet that needs to be retransmitted.
  • the specific process is as described above, and those of ordinary skill in the art can fully understand that it will not be repeated here.
  • the system further includes a data decompressing device 705:
  • the data decompression device is configured to decompress a data packet sent by the data compression device through the feedback channel, obtain a sequence number of the error data packet, and send the sequence number to the data sending device;

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

Abstract

Procédé de compression de données incluant les étapes consistant à : déterminer la valeur de n en fonction de ≤ nombre de paquets ≤ k ; fournir n bits pour identifier le nombre des paquets ; où la valeur dudit nombre n est un nombre entier multiple de k, et la valeur de k est n'importe quel entier naturel autre que zéro ; le nombre de paquets = m+, exprimant la valeur déterminée m lorsque lesdits n bits forment le champ d'identification de nombre de paquets comprimés ; le procédé inclut en outre les étapes consistant à identifier lesdits résultats vérifiés de paquet qui ont les mêmes résultats vérifiés d'erreur par les bits lequel nombre est inférieur au nombre des paquets qui ont continuellement les mêmes résultats vérifiés d'erreur, lesdits bits forment de façon ordonnée le champ d'identification d'erreur comprimée. L'invention fournit en outre un appareil de compression de données correspondant et un système de rétroaction de demande automatique de répétition utilisant cet appareil de compression de données. Le procédé de la présente invention réduit les dépenses du système causées par la rétroaction dans le système ARQ et économise la ressource du système.
PCT/CN2007/070998 2006-11-02 2007-10-31 Procédé et appareil de compression de données et système de rétroaction de demande automatique de répétition WO2008052483A1 (fr)

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CN200610138008.X 2006-11-02
CNA200610138008XA CN101174929A (zh) 2006-11-02 2006-11-02 数据压缩方法、装置及自动请求重发反馈系统

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CN113812959A (zh) * 2021-07-26 2021-12-21 北京海思敏医疗技术有限公司 用于小型数据处理设备的心电数据处理方法、电子设备和存储介质

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CN104579573B (zh) * 2015-01-19 2017-12-26 北京华力创通科技股份有限公司 数据传输的反馈信息的编码、解码方法及发送端和接收端
CN110602069B (zh) * 2019-08-29 2022-02-22 深圳市元征科技股份有限公司 一种网络协议压缩方法、网络协议使用方法及相关产品

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