WO2018214070A1 - 译码的方法和装置 - Google Patents

译码的方法和装置 Download PDF

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Publication number
WO2018214070A1
WO2018214070A1 PCT/CN2017/085764 CN2017085764W WO2018214070A1 WO 2018214070 A1 WO2018214070 A1 WO 2018214070A1 CN 2017085764 W CN2017085764 W CN 2017085764W WO 2018214070 A1 WO2018214070 A1 WO 2018214070A1
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WIPO (PCT)
Prior art keywords
information
transport block
priori
priori information
transport
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PCT/CN2017/085764
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English (en)
French (fr)
Inventor
吴可镝
魏岳军
王旭
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201780090598.XA priority Critical patent/CN110612669B/zh
Priority to EP17910654.7A priority patent/EP3624349B1/en
Priority to PCT/CN2017/085764 priority patent/WO2018214070A1/zh
Publication of WO2018214070A1 publication Critical patent/WO2018214070A1/zh
Priority to US16/691,299 priority patent/US11477170B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
    • H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
    • 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
    • H04L1/0045—Arrangements at the receiver end
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/37—Decoding methods or techniques, not specific to the particular type of coding provided for in groups H03M13/03 - H03M13/35
    • H03M13/45—Soft decoding, i.e. using symbol reliability information
    • 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
    • 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
    • H04L1/1671—Details of the supervisory signal the supervisory signal being transmitted together with control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0012—Modulated-carrier systems arrangements for identifying the type of modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/22—Parsing or analysis of headers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
    • H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
    • H04L9/0819—Key transport or distribution, i.e. key establishment techniques where one party creates or otherwise obtains a secret value, and securely transfers it to the other(s)
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/14—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols using a plurality of keys or algorithms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/06—Transport layer protocols, e.g. TCP [Transport Control Protocol] over wireless

Definitions

  • the present disclosure relates to the field of communications, and in particular, to a method and apparatus for decoding.
  • the transmission service is mostly a transmission service based on Transmission Control Protocol (TCP).
  • TCP Transmission Control Protocol
  • the terminal receives the service data sent by the TCP server, and sends the feedback information to the TCP server.
  • the feedback information may be an Acknowledgement (ACK).
  • the TCP server performs operations such as retransmission or continued transmission based on the feedback information.
  • the terminal forwards the feedback information to the TCP server through the base station; the specific process is: the terminal encodes the feedback information to obtain a transmission block including feedback information, and sends the transmission block to the base station.
  • the transport block, the base station decodes the transport block, and sends the decoded decoding result to the TCP server, and the TCP server receives the decoded result, thereby obtaining the feedback information sent by the terminal.
  • the feedback information needs to be carried in the header information of the transport layer, respectively, in a Packet Data Convergence Protocol (PDCP) layer, and a radio link layer control (Radio Link). Control, RLC) layer, media access control (MAC) layer processing the header information of the transport layer, and encoding the processed information to generate a transport block containing feedback information, the process is specifically:
  • the terminal In the transport layer, the terminal carries the feedback information in the transport layer header information, and sends the header information of the transport layer to the PDCP layer.
  • the terminal adds header information of the PDCP layer to the header information of the transport layer, generates protocol data unit (PDU) information, and sends the PDU information to the RLC layer.
  • the terminal segments and concatenates the PDU information at the RLC layer, adds the header information of the RLC layer, and sends the PDU information to which the RLC layer header information is added to the MAC layer.
  • the terminal continues to add the MAC layer header information to the PDU information that adds the RLC layer header information at the MAC layer, and encodes the PDU information to which the RLC layer header information and the MAC layer header information are added, to obtain a transport block.
  • the terminal transmits the transport block to the base station.
  • the base station receives the transport block sent by the terminal, and decodes the transport block.
  • the decoding process is specifically: the base station acquires the demodulation soft value of the transport block, and converts the demodulated soft value and the transport block into the physical layer.
  • the coder decodes the transport block by the channel decoder.
  • the transport block When the transport block is encoded by the feedback information, information such as header information of the transport layer, header information of the PDCP layer, header information of the RLC layer, header information of the MAC layer, and the like are combined.
  • the transport block when decoding a transport block, the transport block is decoded only according to the demodulation soft value, and the error rate is high, resulting in a low accuracy of the decoding method.
  • a method of decoding comprising:
  • the receiving end composes the a priori information set by extracting the a priori information from the at least one first transport block that is successfully decoded by the history, and the a priori information includes the at least one first transport block that is successfully decoded by the history.
  • the header information of the transport protocol layer when receiving the second transport block to be decoded sent by the transmitting end, the receiving end selects the first a priori information from the a priori information set, and the second transport block is the sending And transmitting, by the terminal, the transport block obtained by encoding the third transport block; then, the receiving end decodes the second transport block according to the first prior information and the first demodulation information of the second transport block, to obtain the first Three transport blocks.
  • the second transport block is decoded by the receiving end combining the first demodulation information and the first a priori information, where the first a priori information includes a header of a transport protocol layer in the at least one first transport block that is successfully decoded by the history.
  • the information therefore, reduces the bit error rate at which the receiving end decodes the second transport block, and improves the accuracy of decoding.
  • the method before the selecting the first prior information from the a priori information set, the method further includes:
  • the receiving end first decodes the second transport block according to the first demodulation information of the second transport block, and if the decoding fails, that is, the fourth transport block and the third transport block are different, and then selects the first
  • the a priori information is such that the receiving end can subsequently decode the second transport block by combining the first a priori information and the first demodulated information, thereby improving the efficiency of decoding.
  • the method further includes:
  • the receiving end acquires the first verification information of the third transmission block, and the first verification information of the fourth transmission block, and determines whether the second transmission is performed according to the first verification information and the second verification information.
  • the block decoding is successful, thereby improving the accuracy of determining whether the decoding is successful.
  • the at least one a priori information is extracted from the at least one first transport block that is successfully decoded by history, and the at least one a priori information is formed into a priori information set, including :
  • the at least one a priori information is formed into the a priori information set.
  • the receiving end may extract the header information of the transport protocol layer in each first transport block, and generate at least one a priori information by using the header information of the transport protocol layer in each first transport block, the at least one first Test information constitutes a priori letter set Therefore, the receiving end can directly select the first a priori information from the a priori information set, thereby improving the efficiency of the receiving end acquiring the first prior information.
  • the decoding by using the first a priori information and the first demodulation information of the second transport block, After the third transport block, the method further includes:
  • the a priori information set is updated based on the extracted a priori information.
  • the receiving end extracts a priori information from the third transmission block successfully obtained by decoding, and updates the prior information set in real time according to the extracted prior information, thereby ensuring the first
  • the timeliness and accuracy of the information collection are improved, and the accuracy of obtaining the first prior information by the receiving end is improved.
  • the third transport block includes:
  • the second demodulated information is demodulated information obtained by saturating the first demodulated information by using the first a priori information
  • the second demodulated information obtained by the receiving end according to the saturation processing is The second transport block performs decoding, thereby improving the accuracy of decoding.
  • the decoding, by using the second demodulation information, the second transport block, to obtain the third transport block includes:
  • the fifth transport block is different from the third transport block, selecting second a priori information from the a priori information set, wherein the second prior information is the a priori information set except the Any prior information other than a priori information;
  • the receiving end may further continue from the a priori information set. Selecting the second a priori information, combining the second prior information and the first demodulation information, and decoding the second transport block again, until the decoding succeeds, that is, the receiving end obtains the third transport block, and the receiving end is The second decoding of the second transport block improves the robustness of the decoding method, thereby improving the accuracy of decoding the second transport block by the receiving end.
  • the second transport block is a data block obtained by encrypting, by the sending end, the third transport block, and selecting, by using the a priori information set A priori information, including:
  • the receiving end may be based on the last successfully decoded transport block of the second transport block, that is, the sixth transport block. Determining a first encryption key; encrypting a third a priori information in the a priori information set by using the first encryption key to obtain a first prior information, so that the receiving end can subsequently combine the first prior information and The first demodulation information decodes the encrypted second transport block to improve The applicability of the present decoding method.
  • the determining, according to the sixth transport block, the first encryption key includes:
  • the receiving end when the second transport block is a data block obtained by encrypting the third transport block by the transmitting end, the receiving end extracts the sixth transport block directly from the previous successfully decoded by the second transport block.
  • the second encryption key determines the first encryption key according to the preset key algorithm and the second encryption key, thereby improving the efficiency of the receiving end acquiring the first encryption key.
  • an embodiment of the present disclosure provides a decoding apparatus, where the decoding apparatus includes at least one unit, and at least one unit is used to implement any one of the foregoing first aspect or the first aspect.
  • the method of decoding provided.
  • an embodiment of the present disclosure provides a system chip, which is applied to a receiving end, where the chip includes: an input/output interface, at least one processor, a memory, and a bus; and the input/output interface passes through the bus and the ???said at least one processor is connected to the memory, the input/output interface is used for communication between the receiving end and the transmitting end, and the at least one processor executes an instruction stored in the memory, so that the receiving end A method of decoding as provided by the first aspect or any of the possible implementations of the first aspect.
  • an embodiment of the present disclosure provides a computer storage medium for storing computer software instructions for use by a receiving end, including a program designed to execute a receiving end as described in the first aspect above.
  • the receiving end composes the a priori information set by extracting the a priori information from the at least one first transport block that is successfully decoded by the history, and the a priori information includes the at least one first transport block that is successfully decoded by the history.
  • the header information of the transport protocol layer when receiving the second transport block to be decoded sent by the transmitting end, the receiving end selects the first a priori information from the a priori information set, and the second transport block is the sending And transmitting, by the terminal, the transport block obtained by encoding the third transport block; then, the receiving end decodes the second transport block according to the first prior information and the first demodulation information of the second transport block, to obtain the first Three transport blocks.
  • the second transport block is decoded by the receiving end combining the first demodulation information and the first a priori information, where the first a priori information includes a header of a transport protocol layer in the at least one first transport block that is successfully decoded by the history.
  • the information therefore, reduces the bit error rate at which the receiving end decodes the second transport block, and improves the accuracy of decoding.
  • FIG. 1 is a schematic diagram of an implementation environment of decoding provided by an embodiment of the present disclosure
  • FIG. 2 is a flowchart of a method for decoding provided by an embodiment of the present disclosure
  • FIG. 3 is a schematic diagram of a decoding process provided by an embodiment of the present disclosure.
  • FIG. 4 is a block diagram of a decoding apparatus according to an embodiment of the present disclosure.
  • FIG. 5 is a block diagram of a decoding apparatus according to an embodiment of the present disclosure.
  • FIG. 6 is a block diagram of a decoding apparatus according to an embodiment of the present disclosure.
  • FIG. 7 is a block diagram of a decoding apparatus according to an embodiment of the present disclosure.
  • FIG. 8 is a block diagram of a decoding apparatus according to an embodiment of the present disclosure.
  • FIG. 9 is a block diagram of a decoding apparatus according to an embodiment of the present disclosure.
  • FIG. 1 is a schematic diagram of an implementation environment of a decoding according to an embodiment of the present disclosure, where the implementation environment includes a transmitting end 101 and a receiving end 102.
  • the transmitting end 101 and the receiving end 102 can communicate through a transmission protocol of a wireless communication system
  • the wireless communication system can be any of the following wireless communication systems, including but not limited to: Long Term Evolution (LTE) system. , Universal Mobile Telecommunications System (UMTS), etc.; the wireless communication system may adopt any of the following transmission protocols, including but not limited to: Transmission Control Protocol, User Datagram Protocol (UDP), and the like.
  • LTE Long Term Evolution
  • UMTS Universal Mobile Telecommunications System
  • the wireless communication system may adopt any of the following transmission protocols, including but not limited to: Transmission Control Protocol, User Datagram Protocol (UDP), and the like.
  • the transport protocol layer corresponding to the transport protocol may include a physical layer, a data link layer, and a transport layer.
  • the transmitting end 101 When the transmitting end 101 needs to send the third transport block to the receiving end 102, the transmitting end 101 encodes the third transport block to obtain a second transport block, and sends the second transport block to the receiving end 102.
  • the receiving end 102 receives the first transport block sent by the transmitting end 101, and decodes the first transport block to obtain a third transport block.
  • the sending end 101 encodes the third transport block, and the process of obtaining the second transport block may be:
  • the transmitting end 101 adds the header information of the transport layer to the third transport block, and transmits the third transport block after adding the header information of the transport layer to the data link layer of the transmitting end 101.
  • the transmitting end 101 adds header information of the data link layer to the third transport block after adding the header information of the transport layer, and adds the header information of the transport layer and the header of the data link layer.
  • the third transport block of information is sent to the physical layer of the transmitting end 101.
  • the transmitting end 101 encodes the third transport block to which the header information of the transport layer and the header information of the data link layer are added by the channel coder of the physical layer to obtain a second transport block.
  • the transmitting end 101 transmits a second transport block to the receiving end 102.
  • the receiving end 102 receives the second transport block sent by the transmitting end 101, and decodes the second transport block by the channel decoder of the physical layer of the receiving end 102 to obtain a third transport block.
  • the channel decoder decodes the second transport block, and the process of obtaining the third transport block may be:
  • the channel decoder decodes the second transport block according to the first demodulation information of the second transport block to obtain a fourth transport block. If the fourth transport block and the third transport block are identical, the channel decoder determines that the second transport block is successfully decoded. If the fourth transport block and the third transport block are not identical, the channel decoder determines that the decoding of the second transport block has failed.
  • the header information of the transport protocol layer in the transport block sent by the transmitting end to the receiving end has a correlation; therefore, the receiving end 102 can set the a priori information estimation in the data link layer of the receiving end 102. Module. Whenever the receiving end 102 successfully decodes the received transport block, the receiving end 102 extracts the header information of the transport protocol layer of the successfully decoded transport block by using the a priori information estimation module in the data link layer to obtain the first Test information.
  • the receiving end 102 may combine the a priori information of the transport block successfully decoded by the history and the first demodulated information,
  • the second transport block is decoded.
  • the first demodulation information may include demodulation information of system bits of the second transport block and demodulation information of the check bits.
  • the demodulation information can be a demodulated soft value.
  • the a priori information is the header information of the transport protocol layer of the transport block whose history is successfully decoded. Combining the first a priori information and the first demodulation information, the second transport block is decoded, thereby improving the accuracy of decoding.
  • the transmitting end 101 can be a terminal or a base station; the receiving end 102 can also be a terminal or a base station.
  • the terminal can be a mobile terminal or a computer terminal.
  • the base station may be an evolved base station (Evolved Node B, eNodeB).
  • the base station can be a NodeB base station.
  • the third transport block may be service data or feedback information.
  • the feedback information may be an ACK or a Negative ACKnowledgment (NACK).
  • an embodiment of the present disclosure provides a method for decoding, where an execution body of the method may be a receiving end. As shown in Figure 2, the method includes:
  • Step 201 The receiving end extracts at least one a priori information from at least one first transport block whose history is successfully decoded, and forms at least one a priori information into a priori information set.
  • the receiving end trains the prior information set according to at least one first transport block successfully decoded by the history.
  • this step can be implemented by the following steps 2011-2012.
  • Step 2011 The receiving end acquires at least one first transport block, and extracts header information of a transport protocol layer in each of the at least one first transport block.
  • the receiving end stores the first transport block whose history is successfully decoded into a transport block set, where the transport block set includes at least one first transport block.
  • the receiving end acquires at least one first transport block from the transport block set.
  • the receiving end also stores the decoding time of each transport block in the transport block set.
  • the header information of the transport protocol layer of the transport block whose decoding time is closer to the current time is higher in correlation with the header information of the transport protocol layer of the currently decoded transport block. Therefore, the step of the receiving end acquiring the at least one first transport block may be:
  • the receiving end selects, from the set of transport blocks, a preset number of first transport blocks whose decoding time is closest to the current time according to the decoding time of each first transport block in the transport block set.
  • the preset number may be set and changed as needed. In the embodiment of the present disclosure, the preset number is not specifically limited. For example, the preset number may be 10 or 20 or the like.
  • the header information of the transport protocol layer includes at least header information of the data link layer, and the header information of the transport protocol layer may further include header information of the transport layer. If the header information of the transport protocol layer includes header information of the data link layer, for each first transport block, the step of the receiver extracting the header information of the transport protocol layer of the first transport block may be performed by the following first manner achieve. If the header information of the transport protocol layer includes header information of the data link layer and header information of the transport layer, the step of extracting, by the receiving end, the header information of the transport protocol layer of the first transport block may be performed for each first transport block. This is achieved in the second way below.
  • the receiving end extracting the header information of the transport protocol layer of the first transport block may be: the receiving end extracts the header information of the data link layer in the first transport block.
  • the data link layer includes: a MAC layer, an RLC layer, and a PDCP layer.
  • the header information of the data link layer includes at least one of header information of the MAC layer, header information of the RLC layer, and header information of the PDCP layer.
  • the header information of the MAC layer includes: a logical channel identify (LCID) and the like.
  • LCID logical channel identify
  • the header information of the RLC layer includes: a sequence number (SN) of the RLC layer, and the like.
  • the header information of the PDCP layer includes: the SN number of the PDCP layer, and the like.
  • the step of the receiving end extracting the header information of the transport protocol layer of the first transport block may be:
  • the receiving end extracts the header information of the data link layer and the header information of the transport layer in the first transport block, and splices the header information of the data link layer with the header information of the transport layer to obtain a header of the transport protocol layer. information.
  • the transport layer includes an Internet Protocol (IP) layer and a TCP layer.
  • IP Internet Protocol
  • the header information of the transport layer includes, but is not limited to, any information in the header information of the IP layer and the header information of the TCP layer.
  • the IP layer header information includes: version number + IP header length (1 byte), service type (1 byte), total length of the IP layer header information (2 bytes), tag field + segment offset (2 bytes), Time to Live (TTL) (1 byte), Transfer Protocol (1 byte), Source Address of the first transport block (4 bytes), At least one of a destination address (4 bytes) of a transport block.
  • the TCP layer header information includes: the source port + destination port number (4 bytes) of the sender, the serial number (4 bytes) of the TCP layer, the data offset + the reserved field + the control field (2 bytes), and the emergency pointer ( At least one of the information in 2 bytes).
  • the receiving end has a Robust Header Compression (RoHC) function.
  • RoHC Robust Header Compression
  • the header information of the transport protocol layer includes header information of the data link layer, and the receiving end extracts the header information of the transport protocol layer of the first transport block by using the foregoing first manner.
  • the header information of the transport protocol layer includes header information of the data link layer and header information of the transport layer, and the receiving end extracts the header of the transport protocol layer of the first transport block by using the foregoing second manner. information.
  • Step 2012 The receiving end generates at least one a priori information according to the header information of the transport protocol layer in each of the first transport blocks in the at least one first transport block, and the at least one a priori information is formed into the a priori information set.
  • the receiving end may generate a priori information according to the header information of the transport protocol layer of the first transport block:
  • the receiving end uses the header information of the transport protocol layer of the first transport block as a priori information. or,
  • the receiving end determines the header information of the transport protocol layer of the next transport block according to the header information of the transport protocol layer of the first transport block, and uses the header information of the transport protocol layer of the determined next transport block as the a priori information.
  • the header information of the transport protocol layer in the multiple transport blocks sent by the transmitting end has the correlation.
  • the header information of the transport protocol layer includes the first header information and the second header information.
  • the first header information is header information having the same value in each transport block
  • the second header information is information generated according to header information in other transport blocks.
  • the first header information may be: a source port + a destination port number (4 bytes) of the TCP layer, a Source Address (4 bytes) of the IP layer, a Destination Address (4 bytes), and the like
  • the second header information It may be: the SN number of the PDCP layer, the SN number of the RLC layer, and the like.
  • the step of determining, by the receiving end, the header information of the transport protocol layer of the next transport block according to the header information of the transport protocol layer of the first transport block may be:
  • the receiving end determines the third header information according to the second header information and the preset rule of the transport protocol layer of the first transport block, and forms the first header information and the third header information of the transport protocol layer of the first transport block.
  • the header information of the transport protocol layer of a transport block is not limited to the second header information and the preset rule of the transport protocol layer of the first transport block, and forms the first header information and the third header information of the transport protocol layer of the first transport block.
  • the preset rule may be set and changed as needed.
  • the preset rule is not specifically limited.
  • the preset rule may be to add one to the SN number of the PDCP layer or to increase the SN number of the RLC layer by one.
  • the sequence number of the PDCP layer in the header information of the transport protocol layer in the first transport block is used as an example.
  • the sequence number of the PDCP layer may be 8-bit length binary data: 0000 0001, for which the serial number is included.
  • the binary data of each bit from the 1st bit to the 7th bit is 0, and the receiving end is based on the 1st to 7th.
  • the a priori information generated by the binary data of each bit in the bit may be 10, wherein the binary data 1 of the 1st bit in the a priori information indicates that the information with the sequence number of 0 is extracted, and the second bit of the prior information is extracted.
  • the binary data 0 is the value of the serial number in the bit; the binary data of the 8th bit in the serial number is 1, and the a priori information generated by the receiving end according to the binary data of the 8th bit may be 11, wherein The binary data 1 of the first bit in the a priori information indicates that the information of the sequence number 1 is extracted, and the binary data 1 of the second bit in the a priori information is the information of the sequence number in the eighth bit.
  • the receiving end may set an a priori information estimating module in the data link layer, where the a priori information estimating module is used to successfully decode at least one first transmission from the history. Extracting a priori information in the block and composing a prior information set, as shown in FIG. 3, the receiving end extracts, by the a priori information estimating module, header information of the data link layer in the first transport block that is successfully decoded by at least one history. And header information of the transport layer, generating at least one a priori information, and composing the at least one a priori information into the a priori information set.
  • the receiving end When the receiving end needs to be decoded by the channel decoder of the physical layer, the receiving end sends the first prior in the prior information set to the channel decoder of the physical layer through the a priori information estimating module of the data link layer. information.
  • the receiving end extracts the a priori information through the a priori information estimating module, and the step of forming the a priori information set may be: when the receiving end successfully decodes the at least one first transport block by using the channel decoder of the physical layer, Receiving, by the receiving end, the at least one first transport block that is successfully decoded by the history to the data link layer; then, the receiving end extracts at least one first transmission that is successfully decoded by the history through the a priori information estimation module of the data link layer
  • the header information of the transport protocol layer in the block generates at least one a priori information; and the at least one a priori information is formed into a priori information set.
  • the first transport block may be set and changed according to the user's needs.
  • the first transport block may be used by the sending end to acknowledge the received service data.
  • a transport block, or a transport block that the sender sends a negative response to the received service data; the first transport block may also be a transport block of the service data received by the receiver.
  • the first transmission block is used as a transmission block for the acknowledgment of the received service data.
  • the receiving end may be a base station, and the transmitting end may be a terminal. After receiving the service data sent by the base station, the terminal receives the service data.
  • the first transport block of the acknowledgement response can be sent to the base station.
  • the base station receives the first transport block of the acknowledgement response, so that the terminal confirms that the service data sent by the receiving base station is received.
  • the above step 201 is a process in which the receiving end generates a priori information set.
  • the above step 201 is usually performed only once.
  • step 201 is not required, and step 202 is directly executed.
  • the transmitting end When the transmitting end sends the third transport block to the receiving end, in order to improve the transmission efficiency, the transmitting end encodes the third transport block to obtain the second transport block, and sends the second transport block to the receiving end.
  • the receiving end receives the second transport block sent by the sending end, and performs step 202.
  • the sending end encodes the third transport block, and the step of obtaining the second transport block may be:
  • the transmitting end carries the third transport block in the header information of the transport layer, and sends the header information of the transport layer to the data link layer of the transmitting end.
  • the sender adds header information of the PDCP layer to the header information of the transport layer, generates protocol data unit (PDU) information, and sends the PDU information to the data link layer.
  • PDU protocol data unit
  • RLC layer In the RLC layer, the transmitting end segments and concatenates the PDU information, adds the header information of the RLC layer, and sends the PDU information to which the RLC layer header information is added to the MAC layer.
  • the sender adds the MAC layer header information to the PDU information that adds the RLC layer header information to obtain the second transport block.
  • step 202 is performed to decode the second transport block in combination with the first demodulation information and the a priori information.
  • the first demodulation information of the second transport block may include demodulation information of system bits and demodulation information of check bits. System bits are used to carry business data or feedback information. The check digit is used to carry the check information.
  • the receiving end decodes the second transport block according to the first demodulation information to obtain a fourth transport block.
  • the receiving end determines whether the fourth transport block and the third transport block are the same. If the fourth transport block and the third transport block are identical, it is determined that the decoding is successful. If the fourth transport block and the third transport block are not identical, it is determined that the decoding failed.
  • the step of determining whether the fourth transport block and the third transport block are the same by the receiving end may be:
  • the receiving end acquires the first check information and the second check information, where the first check information is the check information of the third transport block, and the second check information is the check information of the fourth transport block.
  • the receiving end determines whether the first verification information and the second verification information are the same. If the first check information and the second check information are the same, the receiving end determines that the fourth transport block and the third transport block are identical. If the first check information and the second check information are not the same, the receiving end determines that the fourth transport block and the third transport block are different.
  • the transmitting end generates the first verification information according to the preset verification algorithm and the third transport block.
  • the first check information may be carried in the second transport block and sent to the receiving end.
  • the transmitting end may also separately send the first verification information to the receiving end before or after transmitting the second transport block to the receiving end.
  • the step of obtaining the first verification information by the receiving end may be:
  • the receiving end acquires the first verification information from the second transport block. Alternatively, the receiving end receives the first verification information sent by the sending end.
  • the transport blocks sent by the sending end to the receiving end are all encoded transport blocks, that is, the transmitting end encodes the first check information, obtains the third check information, and sends a third check to the receiving end. information.
  • the step of the receiving end acquiring the first verification information from the second transport block may be:
  • the receiving end acquires demodulation information of the check bit in the first demodulation information of the second transport block, and decodes the third check information in the second transport block according to the demodulation information of the check bit to obtain the first A verification message.
  • the receiving end When the receiving end acquires the second check information, the receiving end generates the second check information according to the preset check algorithm and the fourth transport block.
  • the preset check algorithm may be set and changed as needed.
  • the preset check algorithm is not specifically limited.
  • the preset check algorithm may be a Cyclical Redundancy Check (CRC) algorithm.
  • the receiving end extracts the a priori information from the third transport block, and updates the a priori information set according to the extracted prior information.
  • the receiving end may directly add the extracted a priori information to the a priori information set.
  • the receiving end may also replace the a priori information of the transport block that is decoded farthest from the current time in the a priori information set with the extracted a priori information.
  • the process of extracting the a priori information from the third transport block by the receiving end is similar to the process of extracting the a priori information from the first transport block by the receiving end, and details are not described herein again.
  • Step 202 When receiving the second transport block to be decoded sent by the transmitting end, the receiving end selects the first a priori information from the a priori information set, where the second transport block is the transmitting end to the third transport block. The resulting transport block is encoded.
  • the receiving end may randomly select a prior information from the a priori information set, and use the selected a priori information as the first a priori information.
  • the receiving end can also be based on each of the a priori information sets.
  • the decoding success time corresponding to the a priori information is selected according to the decoding success time corresponding to each a priori information, and the a priori information that is successfully decoded from the current time is selected from the a priori information set, and the selected a priori information is used as the a priori information.
  • the receiving end may select one a priori information from the a priori information set, or may select multiple a priori information.
  • the transmitting end may further perform encryption processing on the third transport block, and encode the encrypted third transport block to obtain a second transport block.
  • the receiving end needs to decode the second transport block with the encrypted a priori information.
  • the step of the receiving end selecting the first a priori information from the a priori information set may be:
  • the receiving end selects the third a priori information from the a priori information set, where the third a priori information is the a priori information extracted by the receiving end from the encrypted first transport block; and the first encryption key is determined according to the sixth transport block.
  • the sixth transport block is the last successfully decoded transport block of the second transport block; the third prior information is encrypted by the first encryption key to obtain the first prior information.
  • the transmitting end may encrypt the third transport block in the PDCP layer.
  • the step may be: in the PDCP layer, the sending end acquires a parameter quintuple in the PDCP layer, according to the parameter five yuan.
  • the preset encryption algorithm generates a first encryption key, and performs encryption operation on the third transport block by using the first encryption key to obtain an encrypted third transport block.
  • the parameter quintunal may include: a key (KEY), a count (COUNT), a bearer (BEARER), a direction (DIRECTION), and a length (LENGTH).
  • KEY key
  • COUNT count
  • BEARER bearer
  • DIRECTION direction
  • LENGTH length
  • the parameters KEY, BEARER, DIRECTION, and LENGTH in each transport block have the same value, and the value of the parameter COUNT is different. That is, in a plurality of transport blocks, the changed parameter is COUNT.
  • the parameter COUNT is composed of a Hyper Frame Number (HFN) and a PDCP serial number (SN).
  • HFN and the PDCP SN are used to describe the sequence number corresponding to the third transport block sent by the transmitting end.
  • the value of the HFN is only related to the value of the PDCP SN. That is, the transmitting end sends a transport block to the receiving end, and the value of the PDCP SN is increased by the first preset value. When the value of the PDCP SN reaches the maximum value. When the HFN increases the second preset value, the value of the PDCP SN is cleared.
  • the first preset value or the second preset value may be set and changed according to the user's needs, which is not specifically limited in the embodiment of the present disclosure. For example, the first preset value and the second preset value may both be 1.
  • the receiving end determines, according to the sixth transport block, the first encryption key, the receiving end extracts the second encryption key from the sixth transport block, according to the second encryption key and the preset key algorithm. , determining the first encryption key.
  • the second encryption key is a key stream when the transmitting end encrypts the sixth transport block.
  • the receiving end extracts a second encryption key from the sixth transport block: a first KEY, a first COUNT, a first BEARER, a first DIRECTION, and a first LENGTH, and according to the first COUNT, determines a second COUNT, and the first KEY
  • the second COUNT, the first BEARER, the first DIRECTION, and the first LENGTH constitute a first encryption key.
  • the receiving end determines, according to the first COUNT, the second COUNT step:
  • the receiving end increases the value of the PDCP SN in the first COUNT by a first preset value to obtain a second COUNT.
  • the third a priori information is encrypted by using the first encryption key and the preset encryption algorithm to obtain the first prior information.
  • the preset encryption operation can be set and changed according to the user's needs, which is not specifically limited in the embodiment of the present disclosure.
  • the preset encryption operation can be: a bitwise XOR operation.
  • the receiving end performs a bitwise exclusive OR operation on the first encryption key and the third prior information to obtain first a priori information.
  • the receiving end sends the first a priori information from the data link layer to the physical layer, so that the channel decoder of the physical layer uses the first a priori information and the first demodulated information to perform the second transport block by using the following step 203. Decoding.
  • Step 203 The receiving end decodes the second transport block according to the first a priori information and the first demodulation information of the second transport block, to obtain the third transport block.
  • This step can be implemented by the following steps 2031-2032, including:
  • Step 2031 The receiving end saturates the first demodulated information according to the first a priori information to obtain second demodulated information.
  • the first demodulation information includes demodulation information corresponding to system bits of the second transport block.
  • the first demodulation information includes a plurality of first demodulation sub-informations, and one first demodulation sub-information corresponds to system bit information of one unit bit of the second transmission block.
  • the first prior information includes a plurality of a priori sub-information.
  • a first demodulation sub-information corresponds to a priori sub-information.
  • the receiving end saturates the a priori sub-information by a preset saturation algorithm to obtain a second demodulation sub-information, and the second demodulation sub-information corresponding to each a priori sub-information is composed.
  • Second demodulation information Second demodulation information.
  • Each of the plurality of a priori sub-information includes one unit-bit identification information and one unit-bit transmission protocol layer header information of the first transmission block.
  • the identification information in the a priori sub-information is used to identify whether the header information of the transport protocol layer in the a priori sub-information is used to decode the second transport block.
  • the receiving end sets the first preset information and the second preset information in advance.
  • the first preset information is used to identify that the receiving end saturates each first demodulation sub-information by using a first saturation processing manner.
  • the second preset information is used to identify that the receiving end saturates each first demodulation sub-information by using a second saturation processing manner.
  • the first saturation processing manner is: modifying the information of the preset bit in the first demodulation sub-information to a third preset value, and excluding the preset demodulation information from the first demodulation sub-information.
  • the information of the bit is modified to a fourth preset value.
  • the second saturation processing method is: modifying the information of the preset bit in the first demodulation sub-information to a fifth preset value, and removing other bits in the first demodulation sub-information except the preset bit.
  • the information is modified to the fourth preset value.
  • the receiving end saturates the a priori sub-information by using a preset saturation algorithm
  • the step of obtaining the second demodulation sub-information may be:
  • the receiving end modifies the information of the preset bit in the first demodulation sub-information to a third preset value, and the first demodulation sub-information except the preset bit The information of the bit is modified to a fourth preset value, and the second demodulation sub-information is obtained.
  • the receiving end modifies the information of the preset bit in the first demodulation sub-information to a fifth preset value, and the first demodulation sub-information except the preset bit The information of the bit is modified to a fourth preset value, and the second demodulation sub-information is obtained.
  • the first demodulation information is received by the receiving end for the first demodulation sub-information corresponding to the a priori sub-information.
  • the sub information is used as the second demodulation sub information.
  • the first preset information is different from the second preset information. Moreover, the first preset information and the second preset information may be set and changed as needed, and are not specifically limited in the embodiment of the present disclosure. For example, if the a priori sub-information is identified by the binary data, the first preset information may be 11 and the second preset information may be 10.
  • the demodulation information may be a demodulation soft value
  • the first demodulation information includes a demodulation soft value corresponding to information of each unit bit in a system bit of the second transport block.
  • the preset bit can be set and changed according to the needs of the user, which is not specifically limited in the embodiment of the present disclosure.
  • the corresponding demodulation soft value may be 8 bits
  • the preset bit may be the first bit or the first of the 8 bits. 8 bits and so on.
  • the preset bit is used to carry information identifying that the demodulation soft value is a positive or negative number. When the preset bit information is 1, it indicates that the demodulation soft value is a positive number, and when the preset bit information is 0, it indicates that the demodulation soft value is a negative number.
  • the identification information in the a priori information may be set and changed according to the needs of the user, and is not specifically limited in the embodiment of the present disclosure.
  • the identification information in the a priori sub-information may be binary data 0 or 1. If the identifier information in the a priori sub-information is 1, the receiving end determines that the header information of the transport protocol layer in the a priori sub-information is used to decode the second transport block; if the identifier in the a priori sub-information When the information is 0, the receiving end determines that the header information of the transport protocol layer in the a priori sub-information is not used to decode the second transport block.
  • the third preset value is used to identify that the demodulation soft value is a positive value.
  • the fourth preset value is used to identify the value of each bit in the demodulated soft value.
  • the fifth preset value is used to identify that the demodulation soft value is a negative value.
  • the third preset value is the same as the fourth preset value, and the third preset value (or the fourth preset value) is different from the fifth preset value.
  • the third preset value, the fourth preset value, and the fifth preset value may be set and changed according to the user's needs, which is not specifically limited in the embodiment of the present disclosure.
  • the third preset value is 1, the fourth preset value is 1, and the fifth preset value is 0 or the like.
  • the demodulation soft value is demodulated as an example. If the information of each unit bit in the system bit of the second transport block corresponds to a demodulation soft value, the bit width is 8 bits, where the preset bit is For the first bit, the remaining 7 bits are used to carry the specific value of the demodulated soft value.
  • the bit width of a priori sub-information may be 2 bits, wherein the first bit is used to carry the identification information, the second bit is used to carry the header information of the transport protocol layer, and when the identification information is 1, the a priori sub-information The header information of the transport protocol layer is used to decode the second transport block.
  • the header information of the transport protocol layer in the a priori sub-information is not used to decode the second transport block, and the identifier information is 1.
  • the first preset information may be 11, the second preset information may be 10, the third preset value may be 1, the fourth preset value may be 1, and the fifth preset value may be 0;
  • the a priori sub-information can be 01 or 00.
  • the demodulation soft value is saturated by the following formula 1:
  • LLR 0 is the demodulation soft value corresponding to the information of the kth bit in the system bit of the second transport block
  • LLR(k) denotes the demodulation after saturation processing
  • the receiving end saturates the first demodulated information by using the first a priori information to obtain second demodulated information, where the first a priori information includes the header information of the transport protocol layer, and
  • the header information of the transport protocol layer in the second transport block has a correlation with the header information of the transport protocol layer of the first transport block. Therefore, the receiving end decodes the second transport block by using the second demodulation information, thereby improving the accuracy of decoding the second transport block.
  • the receiving end may set a processing module in the physical layer, and perform saturation processing on the first demodulation information to obtain second demodulation information, where the process may be: Pass the first prior information from the data link After the layer is sent to the physical layer, the receiving end receives the first a priori information through the processing module of the physical layer, and uses the first a priori information and the preset saturation algorithm to perform the first demodulated information by using the processing module. The saturation processing obtains the second demodulated information.
  • Step 2032 The receiving end decodes the second transport block according to the second demodulation information to obtain the third transport block.
  • the receiving end decodes the second transport block according to the second demodulation information to generate a fifth transport block.
  • the receiving end determines whether the fifth transport block and the third transport block are the same. If the fifth transport block and the third transport block are identical, the receiving end determines that the decoding of the two transport blocks is successful. If the fifth transport block and the third transport block are different, the receiving end determines that the decoding of the second transport block fails. If the decoding of the second transport block is successful, the process ends. If the decoding of the second transport block fails, the receiving end selects a second a priori information from the a priori information set, where the second prior information is any one of the prior information sets except the first prior information. The aforesaid information; the receiving end repeatedly decodes the second transport block according to the second prior information and the first demodulated information until the decoding succeeds, and the third transport block is obtained.
  • the receiving end when the receiving end successfully decodes the second transport block, the receiving end sends the third transport block from the physical layer to the data link layer, and according to the third transport block, in the data link.
  • the a priori information set is updated in the layer, and the process may be: the receiving end extracts the a priori information from the third transport block; and updates the a priori information set according to the extracted prior information.
  • the receiving end when the receiving end successfully decodes the second transport block, the receiving end may store the a priori information through the data link layer. And updating the a priori information set, the step may be: the receiving end extracts the a priori information from the third transport block by using the a priori information estimation module of the data link layer, and adds the extracted a priori information to the prior information set. The updated a priori information set is obtained, and the updated a priori information set is stored.
  • the receiving end composes the a priori information set by extracting the a priori information from the at least one first transport block that is successfully decoded by the history, and the a priori information includes the at least one first transport block that is successfully decoded by the history.
  • the header information of the transport protocol layer when receiving the second transport block to be decoded sent by the transmitting end, the receiving end selects the first a priori information from the a priori information set, and the second transport block is the sending And transmitting, by the terminal, the transport block obtained by encoding the third transport block; then, the receiving end decodes the second transport block according to the first prior information and the first demodulation information of the second transport block, to obtain the first Three transport blocks.
  • the second transport block is decoded by the receiving end combining the first demodulation information and the first a priori information, where the first a priori information includes a header of a transport protocol layer in the at least one first transport block that is successfully decoded by the history.
  • the information therefore, reduces the bit error rate at which the receiving end decodes the second transport block, and improves the accuracy of decoding.
  • FIG. 4 is a block diagram of a device for decoding according to an embodiment of the present disclosure.
  • the device may be applied to a receiving end.
  • the device includes: a first extracting unit 301, a selecting unit 302, and a first decoding unit 303.
  • the first extracting unit 301 is configured to perform step 201 in the above embodiment and its alternatives.
  • the selecting unit 302 is configured to perform step 202 and its alternatives in the foregoing embodiments.
  • the first decoding unit 303 is configured to perform step 203 and its alternatives in the foregoing embodiment.
  • the apparatus includes a second decoding unit 304.
  • the second decoding unit 304 is configured to perform step 202 and its alternatives in the foregoing embodiments.
  • the apparatus includes an acquisition unit 305 and a determination unit 306.
  • the obtaining unit 305 is configured to perform step 202 and its alternatives in the foregoing embodiments.
  • the determining unit 306 is configured to perform step 202 and its alternatives in the foregoing embodiments.
  • the apparatus includes a second extraction unit 307 and an update unit 308.
  • the second extracting unit 307 is configured to perform step 203 and its alternatives in the foregoing embodiment.
  • the updating unit 308 is configured to perform step 203 and its alternatives in the foregoing embodiment.
  • the receiving end composes the a priori information set by extracting the a priori information from the at least one first transport block that is successfully decoded by the history, and the a priori information includes the at least one first transport block that is successfully decoded by the history.
  • the header information of the transport protocol layer when receiving the second transport block to be decoded sent by the transmitting end, the receiving end selects the first a priori information from the a priori information set, and the second transport block is the sending And transmitting, by the terminal, the transport block obtained by encoding the third transport block; then, the receiving end decodes the second transport block according to the first prior information and the first demodulation information of the second transport block, to obtain the first Three transport blocks.
  • the second transport block is decoded by the receiving end combining the first demodulation information and the first a priori information, where the first a priori information includes a header of a transport protocol layer in the at least one first transport block that is successfully decoded by the history.
  • the information therefore, reduces the bit error rate at which the receiving end decodes the second transport block, and improves the accuracy of decoding.
  • the decoding device provided by the foregoing embodiment is only illustrated by the division of each functional module. In actual applications, the function allocation may be completed by different functional modules as needed. The internal structure of the device is divided into different functional modules to complete all or part of the functions described above.
  • the decoding device provided by the foregoing embodiment is the same as the decoding method embodiment, and the specific implementation process is described in detail in the method embodiment, and details are not described herein again.
  • the device includes a network interface 801, a memory 802, and a processor 803.
  • the network interface 801 is configured to receive a transport block.
  • the memory 802 is configured to store instructions and data
  • the processor 803 is configured to read instructions and data stored in the memory 802, and execute:
  • the embodiment of the present disclosure provides a system chip, which is applied to a receiving end.
  • the chip includes: an input/output interface 901, at least one processor 902, a memory 903, and a bus 904.
  • the input/output interface 901 passes through the bus.
  • 904 is connected to the at least one processor 902 and the memory 903, and the input/output interface 901 is used for the receiving end and the sending
  • the at least one processor 902 executes the instructions stored in the memory such that the receiving end performs the steps performed by the receiving end as described above.
  • a person skilled in the art may understand that all or part of the steps of implementing the above embodiments may be completed by hardware, or may be instructed by a program to execute related hardware, and the program may be stored in a computer readable storage medium.
  • the storage medium mentioned may be a read only memory, a magnetic disk or an optical disk or the like.

Abstract

本公开提供了一种译码的方法及装置，属于通信领域。所述方法包括：从历史译码成功的至少一个第一传输块中提取至少一个先验信息，将所述至少一个先验信息组成先验信息集合，一个先验信息包括一个第一传输块的传输协议层的头信息；当接收到发送端发送的待译码的第二传输块时，从所述先验信息集合中选择第一先验信息，所述第二传输块为所述发送端对第三传输块进行编码得到的传输块；根据所述第一先验信息和所述第二传输块的第一解调信息，对所述第二传输块进行译码，得到所述第三传输块。所述装置包括：第一提取单元，选择单元以及第一译码单元。本公开通过结合第一先验信息和第一解调信息对第二传输块进行译码，从而提高了译码的准确率。

Description

译码的方法和装置 技术领域
本公开涉及通信领域，特别涉及一种译码的方法和装置。
背景技术
在当前通信系统中，传输业务大部分为基于传输控制协议(Transmission Control Protocol，TCP)的传输业务。在执行基于TCP的传输业务的过程中，TCP服务器向终端发送业务数据时，终端接收TCP服务器发送的业务数据，并向TCP服务器发送反馈信息。其中，该反馈信息可以为确认应答(Acknowledgement，ACK)。TCP服务器根据该反馈信息，进行重传或者继续传输等操作。例如，该当前通信系统为无线移动蜂窝通信系统时，终端通过基站将该反馈信息转发至TCP服务器；具体过程为：终端对该反馈信息进行编码处理，得到包含反馈信息的传输块，向基站发送该传输块，基站对该传输块进行译码，并将译码得到的译码结果发送至TCP服务器，TCP服务器接收该译码结果，从而获知终端发送的反馈信息。
现有技术中，终端发送该反馈信息时，需将该反馈信息承载在传输层的头信息中，分别在分组数据汇聚协议(Packet Data Convergence Protocol，PDCP)层、无线链路层控制(Radio Link Control，RLC)层、媒体接入控制(Media Access Control，MAC)层对该传输层的头信息进行处理，并对处理得到的信息进行编码生成包含反馈信息的传输块，该过程具体为：在传输层中，终端将该反馈信息承载在传输层头信息中，并将该传输层的头信息发送到PDCP层。在PDCP层中，终端对该传输层的头信息添加PDCP层的头信息，生成协议数据单元(Protocol Data Unit，PDU)信息，将该PDU信息发送至RLC层。终端在RLC层对PDU信息进行分段和级联，并添加RLC层的头信息，将添加了RLC层头信息的PDU信息发送至MAC层。终端在MAC层对添加RLC层头信息的PDU信息继续添加MAC层头信息，并对添加了RLC层头信息、MAC层头信息的PDU信息进行编码，得到传输块。终端向基站发送该传输块。基站接收终端发送的传输块，并对该传输块进行译码，译码过程具体为：基站获取该传输块的解调软值，将该解调软值和该传输块输入物理层的信道译码器，通过该信道译码器对该传输块进行译码。
在实现本公开的过程中，发明人发现现有技术至少存在以下问题：
由于在对反馈信息进行编码得到传输块时，结合了传输层的头信息、PDCP层的头信息、RLC层的头信息、MAC层的头信息等信息。然而在对传输块进行译码时，仅根据解调软值对该传输块进行译码，出错率较高，导致该译码方法的准确率较低。
发明内容
为了解决现有技术的问题，本公开实施例提供了一种译码的方法和装置。所述技术方案如下：
第一方面，提供了一种译码的方法，所述方法包括：
从历史译码成功的至少一个第一传输块中提取至少一个先验信息，将所述至少一个先验信息组成先验信息集合，一个先验信息包括一个第一传输块的传输协议层的头信息；
当接收到发送端发送的待译码的第二传输块时，从所述先验信息集合中选择第一先验信息，所述第二传输块为所述发送端对第三传输块进行编码得到的传输块；
根据所述第一先验信息和所述第二传输块的第一解调信息，对所述第二传输块进行译码，得到所述第三传输块。
本公开实施例中，接收端通过从历史译码成功的至少一个第一传输块中提取先验信息，组成先验信息集合，该先验信息包括该历史译码成功的至少一个第一传输块中的传输协议层的头信息；当接收到发送端发送的待译码的第二传输块时，接收端从该先验信息集合中选择第一先验信息，该第二传输块为该发送端对第三传输块进行编码得到的传输块；然后，接收端根据该第一先验信息和该第二传输块的第一解调信息，对该第二传输块进行译码，得到该第三传输块。由于接收端结合第一解调信息和第一先验信息，对第二传输块进行译码，该第一先验信息包括历史译码成功的至少一个第一传输块中的传输协议层的头信息，因此，减小了接收端对第二传输块进行译码的误码率，提高了译码的准确率。
在第一方面的第一种可能实现方式中，所述从所述先验信息集合中选择第一先验信息之前，所述方法还包括：
根据所述第一解调信息，对所述第二传输块进行译码，得到第四传输块；
如果所述第四传输块和所述第三传输块不相同，执行所述从所述先验信息集合中选择第一先验信息的步骤。
本公开实施例中，接收端先根据第二传输块的第一解调信息对第二传输块译码，如果译码失败，即第四传输块和第三传输块不相同，再选择第一先验信息，从而使得接收端后续可以结合第一先验信息和第一解调信息对第二传输块译码，提高了译码的效率。
在第一方面的第二种可能实现方式中，所述方法还包括：
获取第一校验信息和第二校验信息，所述第一校验信息为所述第三传输块的校验信息，所述第二校验信息为所述第四传输块的校验信息；
如果所述第一校验信息和所述第二校验信息不相同，确定所述第四传输块和所述第三传输块不相同。
本公开实施例中，接收端获取第三传输块的第一检验信息，以及第四传输块的第一检验信息，根据该第一校验信息和第二校验信息，确定是否对第二传输块译码成功，从而提高了确定是否译码成功的准确率。
在第一方面的第三种可能实现方式中，所述从历史译码成功的至少一个第一传输块中提取至少一个先验信息，将所述至少一个先验信息组成先验信息集合，包括：
获取所述至少一个第一传输块；
提取所述至少一个第一传输块中的每个第一传输块中的传输协议层的头信息；
根据所述至少一个第一传输块中的每个第一传输块中的传输协议层的头信息，生成至少一个先验信息；
将所述至少一个先验信息组成所述先验信息集合。
本公开实施例中，接收端可以提取每个第一传输块中传输协议层的头信息，将每个第一传输块中传输协议层的头信息生成至少一个先验信息，将该至少一个先验信息组成先验信集 合，使得接收端可以直接从该先验信息集合中选择第一先验信息，从而提高了接收端获取第一先验信息的效率。
在第一方面的第四种可能实现方式中，所述根据所述第一先验信息和所述第二传输块的第一解调信息，对所述第二传输块进行译码，得到所述第三传输块之后，所述方法还包括：
从所述第三传输块中提取先验信息；
根据提取的先验信息，更新所述先验信息集合。
本公开实施例中，接收端每次译码成功后，从译码成功得到的第三传输块中提取先验信息，并根据提取的先验信息，实时更新先验信息集合，从而保证了先验信息集合的时效性和准确性，提高了接收端获取第一先验信息的准确率。
在第一方面的第五种可能实现方式中，所述根据所述第一先验信息和所述第二传输块的第一解调信息，对所述第二传输块进行译码，得到所述第三传输块，包括：
根据所述第一先验信息，对所述第一解调信息进行饱和处理，得到第二解调信息；
根据所述第二解调信息，对所述第二传输块进行译码，得到所述第三传输块。
本公开实施例中，由于该第二解调信息为通过第一先验信息对第一解调信息进行饱和处理得到的解调信息，接收端根据该饱和处理得到的第二解调信息对第二传输块进行译码，从而提高了译码的准确率。
在第一方面的第六种可能实现方式中，所述根据所述第二解调信息，对所述第二传输块进行译码，得到所述第三传输块，包括：
根据所述第二解调信息，对所述第二传输块进行译码，得到第五传输块；
如果所述第五传输块和所述第三传输块不同，从所述先验信息集合中选择第二先验信息，所述第二先验信息为所述先验信息集合中除所述第一先验信息以外的任一先验信息；
根据所述第二先验信息和所述第一解调信息，对所述第二传输块进行译码，得到所述第三传输块。
本公开实施例中，如果接收端根据第二解调信息对第二传输块译码失败，即第五传输块和第三传输块不相同，此时，接收端还可以继续从先验信息集合中选择第二先验信息，结合第二先验信息和第一解调信息，对第二传输块进行再次译码，直到译码成功，即接收端得到第三传输块为止，通过接收端对第二传输块进的次译码，提高了本译码的方法的鲁棒性，从而提高了接收端对第二传输块译码的准确率。
在第一方面的第七种可能实现方式中，所述第二传输块为所述发送端对所述第三传输块进行加密得到的数据块；所述从所述先验信息集合中选择第一先验信息，包括：
从所述先验信息集合中选择第三先验信息，所述第三先验信息为所述接收端从加密后的第一传输块中提取的先验信息；
根据第六传输块，确定第一加密密钥，所述第六传输块为所述第二传输块的上一个译码成功的传输块；
通过所述第一加密密钥，对所述第三先验信息进行加密，得到所述第一先验信息。
本公开实施例中，当第二传输块为发送端对第三传输块进行加密得到的数据块时，接收端可以根据第二传输块的上一个译码成功的传输块，即第六传输块，确定第一加密密钥；通过第一加密密钥对先验信息集合中的第三先验信息进行加密处理，得到第一先验信息，进而使得接收端后续可以结合第一先验信息和第一解调信息对加密的第二传输块进行译码，提高 了本译码方法的适用性。
在第一方面的第八种可能实现方式中，所述根据第六传输块，确定第一加密密钥，包括：
从所述第六传输块中提取第二加密密钥；
根据所述第二加密密钥和预设密钥算法，确定所述第一加密密钥。
本公开实施例中，当第二传输块为发送端对第三传输块进行加密得到的数据块时，接收端通过直接从第二传输块的上一个译码成功的第六传输块中提取第二加密密钥，根据预设密钥算法和该第二加密密钥即可确定出第一加密密钥，从而提高了接收端获取第一加密密钥的效率。
第二方面，本公开实施例提供了一种译码的装置，该译码的装置包括至少一个单元，至少一个单元用于实现上述第一方面或第一方面中任意一种可能的实现方式所提供的译码的方法。
第三方面，本公开实施例提供了一种系统芯片，应用于接收端中，所述芯片包括：输入输出接口、至少一个处理器、存储器和总线；所述输入输出接口通过所述总线与所述至少一个处理器和所述存储器相连，所述输入输出接口用于所述接收端与发送端之间的通信，所述至少一个处理器执行所述存储器中存储的指令，使得所述接收端执行如上述第一方面或第一方面中任意一种可能的实现方式所提供的译码的方法。
第四方面，本公开实施例提供了一种计算机存储介质，用于存储为接收端所用的计算机软件指令，其包含用于执行如上述第一方面为接收端所设计的程序。
本公开实施例提供的技术方案带来的有益效果是：
本公开实施例中，接收端通过从历史译码成功的至少一个第一传输块中提取先验信息，组成先验信息集合，该先验信息包括该历史译码成功的至少一个第一传输块中的传输协议层的头信息；当接收到发送端发送的待译码的第二传输块时，接收端从该先验信息集合中选择第一先验信息，该第二传输块为该发送端对第三传输块进行编码得到的传输块；然后，接收端根据该第一先验信息和该第二传输块的第一解调信息，对该第二传输块进行译码，得到该第三传输块。由于接收端结合第一解调信息和第一先验信息，对第二传输块进行译码，该第一先验信息包括历史译码成功的至少一个第一传输块中的传输协议层的头信息，因此，减小了接收端对第二传输块进行译码的误码率，提高了译码的准确率。
附图说明
图1是本公开实施例提供的译码的实施环境示意图；
图2是本公开实施例提供的译码的方法流程图；
图3是本公开实施例提供的译码过程示意图；
图4是本公开实施例提供的译码装置框图；
图5是本公开实施例提供的译码装置框图；
图6是本公开实施例提供的译码装置框图；
图7是本公开实施例提供的译码装置框图；
图8是本公开实施例提供的译码装置框图；
图9是本公开实施例提供的译码装置框图。
具体实施方式
为使本公开的目的、技术方案和优点更加清楚，下面将结合附图对本公开实施方式作进一步地详细描述。
上述所有可选技术方案，可以采用任意结合形成本公开的可选实施例，在此不再一一赘述。
参见图1，图1为本公开实施例提供的一种译码的实施环境示意图，该实施环境包括发送端101和接收端102。
其中，该发送端101和该接收端102可以通过无线通信系统的传输协议进行通信，该无线通信系统可以为以下任一无线通信系统，包括但不限于：长期演进(Long Term Evolution，LTE)系统、通用移动通信系统(Universal Mobile Telecommunications System，UMTS)等；该无线通信系统可以采用以下任一传输协议，包括但不限于：传输控制协议、用户数据协议(User Datagram Protocol，UDP)等。其中，发送端101和接收端102通过无线通信系统的传输协议进行通信时，该传输协议对应的传输协议层可以包括物理层、数据链路层、传输层。
当发送端101需要向接收端102发送第三传输块时，发送端101对第三传输块进行编码，得到第二传输块，向接收端102发送第二传输块。接收端102接收发送端101发送的第一传输块，对第一传输块进行译码，得到第三传输块。
发送端101对第三传输块进行编码，得到第二传输块的过程可以为：
在发送端101的传输层中，发送端101在第三传输块中添加传输层的头信息，将添加传输层的头信息后的第三传输块发送到发送端101的数据链路层。在该数据链路层，发送端101在该添加传输层的头信息后的第三传输块中添加数据链路层的头信息，将该添加了传输层的头信息和数据链路层的头信息的第三传输块发送到发送端101的物理层。发送端101通过物理层的信道编码器对该添加了传输层的头信息和数据链路层的头信息的第三传输块进行编码，得到第二传输块。发送端101向接收端102发送第二传输块。
接收端102接收发送端101发送的第二传输块，通过接收端102的物理层的信道译码器对该第二传输块进行译码，得到第三传输块。其中，信道译码器对第二传输块进行译码，得到第三传输块的过程可以为：
信道译码器根据第二传输块的第一解调信息，对第二传输块进行译码，得到第四传输块。如果第四传输块和第三传输块相同，信道译码器确定对第二传输块译码成功。如果第四传输块和第三传输块不相同，信道译码器确定对第二传输块译码失败。
在本公开实施例中，由于发送端发送给接收端的传输块中的传输协议层的头信息具有相关性；因此，接收端102可以在接收端102的数据链路层中设置先验信息预估模块。每当接收端102对接收到的传输块译码成功时，接收端102通过数据链路层中的先验信息预估模块提取该译码成功的传输块的传输协议层的头信息，得到先验信息。
本公开实施例提供的一种可能的设计中，接收端102对第二传输块译码失败时，接收端102可以结合历史译码成功的传输块的先验信息和第一解调信息，对第二传输块进行译码。其中，该第一解调信息可以包括第二传输块的系统位的解调信息和校验位的解调信息。解调信息可以为解调软值。先验信息为历史译码成功的传输块的传输协议层的头信息。结合该第一先验信息和第一解调信息，对该第二传输块进行译码，从而提高了译码的准确率。
发送端101可以为终端或者基站；接收端102也可以为终端或者基站。终端可以为手机终端或者电脑终端。当无线通信系统为LTE系统时，基站可以为演进型基站(Evolved Node B，eNodeB)。当无线通信系统为UMTS时，基站可以为NodeB基站。第三传输块可以为业务数据，也可以为反馈信息。反馈信息可以为ACK或者否定应答(Negative ACKnowledgment,NACK)。
参见图2，本公开实施例提供一种译码的方法，该方法的执行主体可以为接收端。如图2所示，该方法包括：
步骤201：接收端从历史译码成功的至少一个第一传输块中提取至少一个先验信息，将至少一个先验信息组成先验信息集合。
在对接收到的传输块进行译码之前，接收端根据历史译码成功的至少一个第一传输块，训练得到先验信息集合。相应的，本步骤可以通过以下步骤2011-2012实现。
步骤2011：接收端获取至少一个第一传输块，提取该至少一个第一传输块中的每个第一传输块中的传输协议层的头信息。
接收端将历史译码成功的第一传输块存储到传输块集合中，该传输块集合中包括至少一个第一传输块。在训练得到先验信息集合时，接收端从该传输块集合中获取至少一个第一传输块。
在一个可能的实现方式中，接收端还存储传输块集合中的每个传输块的译码时间。由于译码时间离当前时间越近的传输块的传输协议层的头信息与当前译码的传输块的传输协议层的头信息相关性越高。因此，接收端获取至少一个第一传输块的步骤可以为：
接收端根据该传输块集合中的每个第一传输块的译码时间，从该传输块集合中选择译码时间离当前时间最近的预设数目个第一传输块。其中，预设数目可以根据需要进行设置并更改，在本公开实施例中，对预设数目不作具体限定。例如，预设数目可以为10或则20等。
本公开实施例中，该传输协议层的头信息至少包括数据链路层的头信息，该传输协议层的头信息还可以包括传输层的头信息。如果该传输协议层的头信息包括数据链路层的头信息；则对于每个第一传输块，接收端提取该第一传输块的传输协议层的头信息的步骤可以通过以下第一种方式实现。如果该传输协议层的头信息包括数据链路层的头信息和传输层的头信息时，则对于每个第一传输块，接收端提取第一传输块的传输协议层的头信息的步骤可以通过以下第二种方式实现。
对于第一种实现方式，接收端提取该第一传输块的传输协议层的头信息的步骤可以为：接收端提取该第一传输块中的数据链路层的头信息。
其中，数据链路层包括：MAC层、RLC层和PDCP层。相应的，数据链路层的头信息包括MAC层的头信息、RLC层的头信息和PDCP层的头信息中的至少一个头信息。
MAC层的头信息包括：逻辑信道标识(logical channel identify，LCID)等。
RLC层的头信息包括：RLC层的序列(Serial Number，SN)号等。
PDCP层的头信息包括：PDCP层的SN号等。
对于第二种实现方式，接收端提取该第一传输块的传输协议层的头信息的步骤可以为：
接收端提取该第一传输块中的数据链路层的头信息和传输层的头信息，并将该数据链路层的头信息与该传输层的头信息进行拼接，得到传输协议层的头信息。
其中，传输层包括网际协议(Internet Protocol，IP)层和TCP层。相应的，传输层的头信息包括但不限于IP层的头信息和TCP层的头信息中的任一信息等。
其中，IP层的头信息包括：版本号+IP包头长度(1字节)、服务类型(1字节)、IP层的头信息的总长度(2字节)、标记字段+分段偏移(2字节)、生存时间(Time to Live，TTL)(1字节)、传输协议(Protocol)(1字节)、第一传输块的源地址(Source Address)(4字节)、第一传输块的目的地址(Destination Address)(4字节)中的至少一个信息。
TCP层的头信息包括：发送端的源端口+目标端口号(4字节)、TCP层的序列号(4字节)、数据偏移+保留字段+控制字段(2字节)、紧急指针(2字节)中的至少一个信息。
需要说明的是，接收端中具有健壮性包头压缩(Robust Header Compression，RoHC)功能。当该RoHC功能处于开启状态时，该传输协议层的头信息包括数据链路层的头信息，接收端通过以上第一种方式提取第一传输块的传输协议层的头信息。当该RoHC功能处于关闭状态时，该传输协议层的头信息包括数据链路层的头信息和传输层的头信息，接收端通过以上第二种方式提取第一传输块的传输协议层的头信息。
步骤2012：接收端根据该至少一个第一传输块中每个第一传输块中的传输协议层的头信息，生成至少一个先验信息，将该至少一个先验信息组成该先验信息集合。
对于每个第一传输块，接收端根据该第一传输块的传输协议层的头信息，生成先验信息的步骤可以为：
接收端将该第一传输块的传输协议层的头信息作为先验信息。或者，
接收端根据该第一传输块的传输协议层的头信息，确定下一个传输块的传输协议层的头信息，将确定的下一个传输块的传输协议层的头信息作为先验信息。
需要说明的是，发送端同一次发送的多个传输块中的传输协议层的头信息具有相关性，实际传输时，该传输协议层的头信息中，包括第一头信息和第二头信息；对于每个传输块，该第一头信息为每个传输块中取值均相同的头信息，该第二头信息为根据其它传输块中的头信息生成的信息。例如，该第一头信息可以为：TCP层的源端口+目标端口号(4字节)、IP层的Source Address(4字节)、Destination Address(4字节)等；该第二头信息可以为：PDCP层的SN号、RLC层的SN号等。相应的，接收端根据该第一传输块的传输协议层的头信息，确定下一个传输块的传输协议层的头信息的步骤可以为：
接收端根据该第一传输块的传输协议层的第二头信息和预设规则，确定第三头信息，将该第一传输块的传输协议层的第一头信息和第三头信息组成下一个传输块的传输协议层的头信息。
预设规则可以根据需要进行设置并更改，在本公开实施例中，对预设规则不作具体限定。例如，预设规则可以为将PDCP层的SN号加一或者将RLC层的SN号加一等。
例如，以第一传输块中传输协议层的头信息中的PDCP层的序列号为例进行说明，该PDCP层的序列号可以为8比特长度的二进制数据：0000 0001，对于该序列号包括的每个比特二进制数据，从第1比特到第7比特中每个比特的二进制数据均为0，接收端根据该从第1到第7 比特中每个比特的二进制数据生成的先验信息可以均为10，其中，先验信息中第1比特的二进制数据1表示对该序列号为0的信息进行提取，先验信息中第2比特的二进制数据0为该序列号在该比特位的取值；该序列号中第8比特的二进制数据为1，接收端根据该第8比特的二进制数据生成的先验信息可以为11，其中，先验信息中第1比特的二进制数据1表示对该序列号为1的信息进行提取，先验信息中第2比特的二进制数据1为该序列号在该第8比特位的信息。
本公开实施例提供的一种可能的设计中，接收端可以在数据链路层中设置先验信息预估模块，该先验信息预估模块用于从历史译码成功的至少一个第一传输块中提取先验信息，并组成先验信息集合，如图3所示，接收端通过该先验信息预估模块提取至少一个历史译码成功的第一传输块中数据链路层的头信息以及传输层的头信息，生成至少一个先验信息，将该至少一个先验信息组成该先验信息集合。
当接收端需要通过物理层的信道译码器译码时，接收端通过数据链路层的先验信息预估模块向物理层的信道译码器发送该先验信息集合中的第一先验信息。其中，接收端通过该先验信息预估模块提取先验信息，组成先验信息集合的步骤可以为：当接收端通过物理层的信道译码器对至少一个第一传输块译码成功时，接收端向数据链路层发送该历史译码成功的至少一个第一传输块；然后，接收端通过数据链路层的先验信息预估模块，提取该历史译码成功的至少一个第一传输块中的传输协议层的头信息，生成至少一个先验信息；将该至少一个先验信息组成先验信息集合。
其中，该第一传输块可以根据用户需要设置并更改，本公开实施例对第一传输块不做具体限定，例如，该第一传输块可以为发送端对接收到的业务数据进行肯定应答的传输块，或发送端对接收到的业务数据进行否定应答的传输块；该第一传输块还可以为接收端接收到的业务数据的传输块。
例如，以第一传输块为发送端对接收到的业务数据进行肯定应答的传输块为例进行说明，该接收端可以为基站、该发送端可以为终端，终端接收到基站发送的业务数据后，可以向基站发送确认应答的第一传输块。基站通过接收该确认应答的第一传输块，从而获知终端确认接收到接收基站发送的业务数据。
以上步骤201是接收端生成先验信息集合的过程。以上步骤201通常仅需要执行一次，后续对接收到的传输块进行译码时，不需要执行步骤201，直接执行步骤202即可。
当发送端向接收端发送第三传输块时，为了提高传输效率，发送端对第三传输块进行编码，得到第二传输块，向接收端发送第二传输块。接收端接收发送端发送的第二传输块，执行步骤202。
其中，发送端对第三传输块进行编码，得到第二传输块的步骤可以为：
发送端将第三传输块承载在传输层的头信息中，并将该传输层的头信息发送到发送端的数据链路层中。在该数据链路层中，发送端在该传输层的头信息中添加PDCP层的头信息，生成协议数据单元(Protocol Data Unit，PDU)信息，并将该PDU信息发送至数据链路层的RLC层。在RLC层，发送端对PDU信息进行分段和级联，并添加RLC层的头信息，将添加了RLC层头信息的PDU信息发送至MAC层。在MAC层，发送端将添加RLC层头信息的PDU信息中添加MAC层头信息得到第二传输块。
如图3所示，接收端对该第二传输块第一次译码时，可以不结合先验信息，直接根据第 一解调信息对该第二传输块进行译码。当译码失败时，执行步骤202，结合第一解调信息和先验信息，对该第二传输块进行译码。其中，该第二传输块的第一解调信息可以包括系统位的解调信息和校验位的解调信息。系统位用于承载业务数据或者反馈信息。校验位用于承载校验信息。
接收端根据第一解调信息，对第二传输块进行译码，得到第四传输块。接收端确定第四传输块和第三传输块是否相同。如果第四传输块和第三传输块相同，确定译码成功。如果第四传输块和第三传输块不相同，确定译码失败。
接收端确定第四传输块和第三传输块是否相同的步骤可以为：
接收端获取第一校验信息和第二校验信息，第一校验信息为第三传输块的校验信息，第二校验信息为第四传输块的校验信息。接收端确定第一校验信息和第二校验信息是否相同。如果第一校验信息和第二校验信息相同，接收端确定第四传输块和第三传输块相同。如果第一校验信息和第二校验信息不相同，接收端确定第四传输块和第三传输块不相同。
发送端根据预设校验算法和第三传输块，生成第一校验信息。发送端向接收端发送第二传输块时，可以将第一校验信息承载在第二传输块中发送给接收端。发送端也可以在向接收端发送第二传输块之前或者之后，单独向接收端发送第一校验信息。相应的，接收端获取第一校验信息的步骤可以为：
接收端从第二传输块中获取第一校验信息。或者，接收端接收发送端发送的第一校验信息。
需要说明的是，发送端向接收端发送的传输块均为编码后的传输块，也即发送端对第一校验信息进行编码，得到第三校验信息，向接收端发送第三校验信息。相应的，接收端从第二传输块中获取第一校验信息的步骤可以为：
接收端获取第二传输块的第一解调信息中的校验位的解调信息，根据该校验位的解调信息对第二传输块中的第三校验信息进行译码，得到第一校验信息。
接收端获取第二校验信息时，接收端根据该预设校验算法和第四传输块，生成第二校验信息。
预设校验算法可以根据需要进行设置并更改，在本公开实施例中，对预设校验算法不作具体限定。例如，预设校验算法可以为循环冗余码校验(Cyclical Redundancy Check，CRC)算法。
在一个可能的实现方式中，当译码成功时，接收端从第三传输块中提取先验信息，根据提取的先验信息，更新先验信息集合。
接收端根据提取的先验信息，更新先验信息集合时，接收端可以直接将提取的先验信息添加到先验信息集合中。接收端也可以将先验信息集合中离当前时间最远译码成功的传输块的先验信息替换为提取的先验信息。
其中，接收端从第三传输块中提取先验信息的过程和接收端从第一传输块中提取先验信息的过程相似，在此不再赘述。
步骤202：当接收到发送端发送的待译码的第二传输块时，接收端从该先验信息集合中选择第一先验信息，该第二传输块为该发送端对第三传输块进行编码得到的传输块。
接收端从先验信息集合中选择第一先验信息时，接收端可以从先验信息集合中随机选择一个先验信息，将选择的先验信息作为第一先验信息。接收端也可以根据先验信息集合中每 个先验信息对应的译码成功时间，根据每个先验信息对应的译码成功时间，从先验信息集合中选择离当前时间最近译码成功的先验信息，将选择的先验信息作为第一先验信息。
需要说明的是，在本步骤中，接收端可以从先验信息集合中选择一个先验信息，也可以选择多个先验信息。
本公开实施例提供的一种可能的设计中，为了提高安全性，发送端还可以对该第三传输块进行加密处理，对加密后的第三传输块进行编码，得到第二传输块。此时接收端就需要用加密后的先验信息对第二传输块进行译码。相应的，接收端从该先验信息集合中选择第一先验信息的步骤可以为：
接收端从先验信息集合中选择第三先验信息，第三先验信息为接收端从加密后的第一传输块中提取的先验信息；根据第六传输块，确定第一加密密钥，第六传输块为第二传输块的上一个译码成功的传输块；通过第一加密密钥，对第三先验信息进行加密，得到第一先验信息。
本公开实施例中，发送端可以在PDCP层对该第三传输块进行加密，该步骤可以为：在PDCP层中，发送端获取PDCP层中的参数五元组，根据该参数五元组以及预设加密算法，生成第一加密密钥，通过该第一加密密钥对该第三传输块进行加密运算，得到加密后的第三传输块。
其中，该参数五元组可以包括：密钥(KEY)、计数(COUNT)、承载(BEARER)、方向(DIRECTION)、长度(LENGTH)。每个传输块中的参数KEY、BEARER、DIRECTION、LENGTH的取值相同，参数COUNT取值不同。即多个传输块中，变化的参数为COUNT。
参数COUNT由超帧号(Hyper Frame Number,HFN)和PDCP序列号(Serial Number，SN)组成，HFN和PDCP SN用于描述发送端发送的第三传输块对应的序号。并且，HFN的取值只与PDCP SN的取值有关，即，发送端每次向接收端发送一个传输块，PDCP SN的取值增加第一预设数值，当PDCP SN的取值达到最大值时，HFN增加第二预设数值，PDCP SN的取值清零。第一预设数值或第二预设数值可以根据用户需要设置并更改，本公开实施例对此不作具体限定。例如，第一预设数值和第二预设数值可以均为1。
其中，接收端根据第六传输块，确定第一加密密钥的步骤可以为：接收端从该第六传输块中提取第二加密密钥，根据该第二加密密钥和预设密钥算法，确定第一加密密钥。
其中，该第二加密密钥为发送端对第六传输块进行加密时的密钥流。接收端从该第六传输块中提取第二加密密钥：第一KEY、第一COUNT、第一BEARER、第一DIRECTION和第一LENGTH，根据第一COUNT，确定第二COUNT，将第一KEY、第二COUNT、第一BEARER、第一DIRECTION和第一LENGTH组成第一加密密钥。
其中，接收端根据第一COUNT，确定第二COUNT的步骤可以为：
接收端将该第一COUNT中的PDCP SN的取值增加第一预设数值，得到第二COUNT。
需要说明的是，通过第一加密密钥和预设加密算法，对第三先验信息进行加密，得到第一先验信息。其中，预设加密运算可以根据用户需要设置并更改，本公开实施例对此不作具体限定。例如，预设加密运算可以为：逐位异或运算。相应的，接收端将该第一加密密钥和第三先验信息进行逐位异或运算，得到第一先验信息。
接收端将第一先验信息从数据链路层发送至物理层，使得物理层的信道译码器利用该第一先验信息以及第一解调信息，通过以下步骤203对第二传输块进行译码。
步骤203：接收端根据该第一先验信息和该第二传输块的第一解调信息，对该第二传输块进行译码，得到该第三传输块。
本步骤可以通过以下步骤2031-2032实现，包括：
步骤2031：接收端根据该第一先验信息，对第一解调信息进行饱和处理，得到第二解调信息。
其中，该第一解调信息包括第二传输块的系统位对应的解调信息。第一解调信息包括多个第一解调子信息，一个第一解调子信息对应第二传输块的一个单位比特的系统位信息。第一先验信息包括多个先验子信息。一个第一解调子信息对应一个先验子信息。对于每个先验子信息，接收端通过预设饱和算法，对该先验子信息进行饱和处理，得到第二解调子信息，将每个先验子信息对应的第二解调子信息组成第二解调信息。
多个先验子信息中的每个先验子信息包括一个单位比特的标识信息和第一传输块的一个单位比特的传输协议层的头信息。对于每个先验子信息，该先验子信息中的标识信息用于标识该先验子信息中的传输协议层的头信息是否用于译码第二传输块。接收端事先设置第一预设信息和第二预设信息。第一预设信息用于标识接收端通过第一种饱和处理方式对每个第一解调子信息进行饱和处理。第二预设信息用于标识接收端通过第二种饱和处理方式对每个第一解调子信息进行饱和处理。其中，第一种饱和处理方式为：将第一解调子信息中的预设比特位的信息修改为第三预设数值，将第一解调子信息中除预设比特位之外的其它比特位的信息修改为第四预设数值。第二种饱和处理方式为：将第一解调子信息中的预设比特位的信息修改为第五预设数值，将第一解调子信息中除预设比特位之外的其它比特位的信息修改为第四预设数值。
相应的，接收端通过预设饱和算法，对该先验子信息进行饱和处理，得到第二解调子信息的步骤可以为：
如果该标识信息标识该先验子信息中的传输协议层的头信息用于译码第二传输块，且该先验子信息为第一预设信息时，对于该先验子信息对应的第一解调子信息，接收端将该第一解调子信息中的预设比特位的信息修改为第三预设数值，将该第一解调子信息中除预设比特位之外的其它比特位的信息修改为第四预设数值，得到第二解调子信息。或者，
如果该标识信息标识该先验子信息中的传输协议层的头信息用于译码第二传输块，且该先验子信息为第二预设信息时，对于该先验子信息对应的第一解调子信息，接收端将该第一解调子信息中的预设比特位的信息修改为第五预设数值，将该第一解调子信息中除预设比特位之外的其它比特位的信息修改为第四预设数值，得到第二解调子信息。或者，
如果该标识信息标识该先验子信息中的传输协议层的头信息不用于译码第二传输块，对于该先验子信息对应的第一解调子信息，接收端将该第一解调子信息作为第二解调子信息。
第一预设信息和第二预设信息不同。并且，第一预设信息和第二预设信息可以根据需要进行设置并更改，在本公开实施例中，对此不作具体限定。例如，通过二进制数据标识先验子信息，则第一预设信息可以为11，第二预设信息可以为10。
其中，解调信息可以为解调软值，则该第一解调信息包括第二传输块的系统位中每个单位比特的信息对应的解调软值。该预设比特位可以根据用户需要设置并更改，本公开实施例对此不作具体限定。例如，对于第二传输块的系统位中每个单位比特的信息，其对应的为解调软值的可以为8比特，该预设比特位可以为8比特位中的第1比特位或者第8比特位等。 对于每个单位比特的信息对应的解调软值，该预设比特位用于承载标识该解调软值为正数或者负数的信息。预设比特位信息为1时，表示该解调软值为正数，预设比特位信息为0时，表示该解调软值为负数。
先验子信息中的标识信息可以根据用户需要设置并更改，本公开实施例对此不作具体限定。例如，如果用二进制数据表示先验子信息，则先验子信息中的标识信息可以为二进制数据0或1。其中，如果该先验子信息中的标识信息为1时，接收端确定该先验子信息中的传输协议层的头信息用于译码第二传输块；如果该先验子信息中的标识信息为0时，接收端确定该先验子信息中的传输协议层的头信息不用于译码第二传输块。
第三预设数值用于标识解调软值为正值。第四预设数值用于标识解调软值中每个比特位的数值。第五预设数值用于标识解调软值为负值。第三预设数值和第四预设数值相同，第三预设数值(或者第四预设数值)和第五预设数值不同。并且，第三预设数值、第四预设数值和第五预设数值可以根据用户需要设置并更改，本公开实施例对此不作具体限定。例如，第三预设数值为1，第四预设数值为1，第五预设数值为0等。
例如，以解调信息为解调软值为例进行说明，如果第二传输块的系统位中每个单位比特的信息对应的解调软值的位宽为8比特，其中，预设比特位为第1比特位，剩余7个比特位用于承载该解调软值的具体数值。一个先验子信息的位宽可以为2比特，其中，第1比特位用于承载标识信息，第2比特位用于承载传输协议层的头信息，标识信息为1时，该先验子信息中的传输协议层的头信息用于译码第二传输块,标识信息为0时，该先验子信息中的传输协议层的头信息不用于译码第二传输块，则标识信息为1时，第一预设信息可以为11，第二预设信息可以为10，第三预设数值可以为1，第四预设数值可以为1，第五预设数值可以为0；当标识信息为0时，该先验子信息可以为01或00。相应的，对于第二传输块的系统位中第k个比特的信息对应的解调软值，通过以下公式一，对该解调软值进行饱和处理：
Figure PCTCN2017085764-appb-000001
其中，k表示第二传输块中的第k个比特位，LLR0为第二传输块系统位中第k个比特的信息对应的解调软值，LLR(k)表示饱和处理后的解调软值，Bit(k)为第二传输块的系统位中第k个比特的信息对应的先验子信息。Bit(k)＝2，即Bit(k)为10时，将该解调软值中预设比特位的数值修改为0，将该解调软值中除预设比特位之外的其它比特位的数值修改为1，得到饱和处理后的解调软值0111 1111，即，LLR(k)＝-127；Bit(k)＝3，即Bit(k)为11时，将该解调软值中预设比特位的数值修改为1，将该解调软值中除预设比特位之外的其它比特位的数值修改为1，得到饱和处理后的解调软值1111 1111，即LLR(k)＝127；Bit(k)＝0或1，即Bit(k)为00或01时，接收端直接将该LLR0作为LLR(k)。
本公开实施例中，接收端通过该第一先验信息，对该第一解调信息饱和处理，得到第二解调信息，由于第一先验信息中包括传输协议层的头信息，而第二传输块中传输协议层的头信息与该第一传输块的传输协议层的头信息具有相关性。因此，接收端通过该第二解调信息对第二传输块进行译码，从而提高了对第二传输块进行译码的准确率。
本公开实施例中，如图3所示，接收端可以在物理层中设置处理模块，用于对该第一解调信息进行饱和处理，得到第二解调信息，该过程可以为：接收端将第一先验信息从数据链 路层发送至物理层后，接收端通过物理层的处理模块接收该第一先验信息，并通过该处理模块，利用该第一先验信息和预设饱和算法，对第一解调信息进行饱和处理，得到第二解调信息。
步骤2032：接收端根据该第二解调信息，对该第二传输块进行译码，得到该第三传输块。
本步骤中，接收端根据该第二解调信息，对该第二传输块进行译码，生成第五传输块。接收端判断第五传输块和第三传输块是否相同。如果第五传输块和第三传输块相同，接收端确定对二传输块译码成功。如果第五传输块和第三传输块不相同，接收端确定对第二传输块译码失败。如果对第二传输块译码成功，结束。如果对第二传输块译码失败，接收端从该先验信息集合中选择第二先验信息，该第二先验信息为该先验信息集合中除该第一先验信息以外的任一先验信息；接收端根据该第二先验信息和该第一解调信息，对该第二传输块进行重复译码，直至译码成功，得到该第三传输块。
本公开实施例中，当接收端对该第二传输块进行译码成功时，接收端将第三传输块由物理层发送至数据链路层，并根据该第三传输块，在数据链路层中更新先验信息集合，该过程可以为：接收端从该第三传输块中提取先验信息；根据提取的先验信息，更新该先验信息集合。
本公开实施例提供的一种可能的设计中，如图3所示，当接收端对该第二传输块进行译码成功时，接收端可以通过数据链路层的先验信息预估模块存储并更新先验信息集合，该步骤可以为：接收端通过数据链路层的先验信息预估模块从该第三传输块中提取先验信息，将提取的先验信息添加到先验信息集合中，得到更新后的先验信息集合，并存储该更新后的先验信息集合。
本公开实施例中，接收端通过从历史译码成功的至少一个第一传输块中提取先验信息，组成先验信息集合，该先验信息包括该历史译码成功的至少一个第一传输块中的传输协议层的头信息；当接收到发送端发送的待译码的第二传输块时，接收端从该先验信息集合中选择第一先验信息，该第二传输块为该发送端对第三传输块进行编码得到的传输块；然后，接收端根据该第一先验信息和该第二传输块的第一解调信息，对该第二传输块进行译码，得到该第三传输块。由于接收端结合第一解调信息和第一先验信息，对第二传输块进行译码，该第一先验信息包括历史译码成功的至少一个第一传输块中的传输协议层的头信息，因此，减小了接收端对第二传输块进行译码的误码率，提高了译码的准确率。
下述为本公开实施例装置实施例，可以用于执行本公开实施例方法实施例。对于本公开实施例装置实施例中未披露的细节，请参照本公开实施例方法实施例。
图4是本公开实施例提供一种译码的装置框图，该装置可以应用在接收端中，参见图4,该装置包括：第一提取单元301、选择单元302和第一译码单元303。
第一提取单元301，用于执行上述实施例中的步骤201及其可选方案。
选择单元302，用于执行上述实施例中的步骤202及其可选方案。
第一译码单元303，用于执行上述实施例中的步骤203及其可选方案。
参见图5,该装置包括第二译码单元304。
第二译码单元304，用于执行上述实施例中的步骤202及其可选方案。
参见图6,该装置包括获取单元305和确定单元306。
获取单元305，用于执行上述实施例中的步骤202及其可选方案。
确定单元306，用于执行上述实施例中的步骤202及其可选方案。
参见图7,该装置包括第二提取单元307和更新单元308。
第二提取单元307，用于执行上述实施例中的步骤203及其可选方案。
更新单元308，用于执行上述实施例中的步骤203及其可选方案。
本公开实施例中，接收端通过从历史译码成功的至少一个第一传输块中提取先验信息，组成先验信息集合，该先验信息包括该历史译码成功的至少一个第一传输块中的传输协议层的头信息；当接收到发送端发送的待译码的第二传输块时，接收端从该先验信息集合中选择第一先验信息，该第二传输块为该发送端对第三传输块进行编码得到的传输块；然后，接收端根据该第一先验信息和该第二传输块的第一解调信息，对该第二传输块进行译码，得到该第三传输块。由于接收端结合第一解调信息和第一先验信息，对第二传输块进行译码，该第一先验信息包括历史译码成功的至少一个第一传输块中的传输协议层的头信息，因此，减小了接收端对第二传输块进行译码的误码率，提高了译码的准确率。
需要说明的是：上述实施例提供的译码的装置在译码时，仅以上述各功能模块的划分进行举例说明，实际应用中，可以根据需要而将上述功能分配由不同的功能模块完成，即将设备的内部结构划分成不同的功能模块，以完成以上描述的全部或者部分功能。另外，上述实施例提供的译码的装置与译码的方法实施例属于同一构思，其具体实现过程详见方法实施例，这里不再赘述。
本公开实施例提供了一种接收端，参见图8，该设备包括网络接口801、存储器802和处理器803。
网络接口801用于接收传输块；
存储器802用于存储指令和数据；
处理器803，用于读取存储器802中存储的指令和数据，执行：
从历史译码成功的至少一个第一传输块中提取至少一个先验信息，将该至少一个先验信息组成先验信息集合，一个先验信息包括一个第一传输块的传输协议层的头信息；
当接收到发送端发送的待译码的第二传输块时，从该先验信息集合中选择第一先验信息，该第二传输块为该发送端对第三传输块进行编码得到的传输块；
根据该第一先验信息和该第二传输块的第一解调信息，对该第二传输块进行译码，得到该第三传输块。
本公开实施例提供了一种系统芯片，应用于接收端中，参见图9，该芯片包括：输入输出接口901、至少一个处理器902、存储器903和总线904；该输入输出接口901通过该总线904与该至少一个处理器902和该存储器903相连，该输入输出接口901用于该接收端与发 送端之间的通信，该至少一个处理器902执行该存储器中存储的指令，使得该接收端执行如上述接收端执行的步骤。
本领域普通技术人员可以理解实现上述实施例的全部或部分步骤可以通过硬件来完成，也可以通过程序来指令相关的硬件完成，所述的程序可以存储于一种计算机可读存储介质中，上述提到的存储介质可以是只读存储器，磁盘或光盘等。
以上所述仅为本公开的可选实施例，并不用以限制本公开，凡在本公开的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本公开的保护范围之内。

Claims (18)

  1. 一种译码的方法，其特征在于，所述方法包括：
    从历史译码成功的至少一个第一传输块中提取至少一个先验信息，将所述至少一个先验信息组成先验信息集合，一个先验信息包括一个第一传输块的传输协议层的头信息；
    当接收到发送端发送的待译码的第二传输块时，从所述先验信息集合中选择第一先验信息，所述第二传输块为所述发送端对第三传输块进行编码得到的传输块；
    根据所述第一先验信息和所述第二传输块的第一解调信息，对所述第二传输块进行译码，得到所述第三传输块。
  2. 根据权利要求1所述的方法，其特征在于，所述从所述先验信息集合中选择第一先验信息之前，所述方法还包括：
    根据所述第一解调信息，对所述第二传输块进行译码，得到第四传输块；
    如果所述第四传输块和所述第三传输块不相同，执行所述从所述先验信息集合中选择第一先验信息的步骤。
  3. 根据权利要求2所述的方法，其特征在于，所述方法还包括：
    获取第一校验信息和第二校验信息，所述第一校验信息为所述第三传输块的校验信息，所述第二校验信息为所述第四传输块的校验信息；
    如果所述第一校验信息和所述第二校验信息不相同，确定所述第四传输块和所述第三传输块不相同。
  4. 根据权利要求1所述的方法，其特征在于，所述从历史译码成功的至少一个第一传输块中提取至少一个先验信息，将所述至少一个先验信息组成先验信息集合，包括：
    获取所述至少一个第一传输块；
    提取所述至少一个第一传输块中的每个第一传输块中的传输协议层的头信息；
    根据所述至少一个第一传输块中的每个第一传输块中的传输协议层的头信息，生成至少一个先验信息；
    将所述至少一个先验信息组成所述先验信息集合。
  5. 根据权利要求1或4所述的方法，其特征在于，所述根据所述第一先验信息和所述第二传输块的第一解调信息，对所述第二传输块进行译码，得到所述第三传输块之后，所述方法还包括：
    从所述第三传输块中提取先验信息；
    根据提取的先验信息，更新所述先验信息集合。
  6. 根据权利要求1-4任一所述的方法，其特征在于，所述根据所述第一先验信息和所述第二传输块的第一解调信息，对所述第二传输块进行译码，得到所述第三传输块，包括：
    根据所述第一先验信息，对所述第一解调信息进行饱和处理，得到第二解调信息；
    根据所述第二解调信息，对所述第二传输块进行译码，得到所述第三传输块。
  7. 根据权利要求6所述的方法，其特征在于，所述根据所述第二解调信息，对所述第二传输块进行译码，得到所述第三传输块，包括：
    根据所述第二解调信息，对所述第二传输块进行译码，得到第五传输块；
    如果所述第五传输块和所述第三传输块不同，从所述先验信息集合中选择第二先验信息，所述第二先验信息为所述先验信息集合中除所述第一先验信息以外的任一先验信息；
    根据所述第二先验信息和所述第一解调信息，对所述第二传输块进行译码，得到所述第三传输块。
  8. 根据权利要求1所述的方法，其特征在于，所述第二传输块为所述发送端对所述第三传输块进行加密得到的传输块；所述从所述先验信息集合中选择第一先验信息，包括：
    从所述先验信息集合中选择第三先验信息，所述第三先验信息为所述接收端从加密后的第一传输块中提取的先验信息；
    根据第六传输块，确定第一加密密钥，所述第六传输块为所述第二传输块的上一个译码成功的传输块；
    通过所述第一加密密钥，对所述第三先验信息进行加密，得到所述第一先验信息。
  9. 根据权利要求8所述的方法，其特征在于，所述根据第六传输块，确定第一加密密钥，包括：
    从所述第六传输块中提取第二加密密钥；
    根据所述第二加密密钥和预设密钥算法，确定所述第一加密密钥。
  10. 一种译码的装置，其特征在于，所述装置包括：
    第一提取单元，用于从历史译码成功的至少一个第一传输块中提取至少一个先验信息，将所述至少一个先验信息组成先验信息集合，一个先验信息包括一个第一传输块的传输协议层的头信息；
    选择单元，用于当接收到发送端发送的待译码的第二传输块时，从所述先验信息集合中选择第一先验信息，所述第二传输块为所述发送端对第三传输块进行编码得到的传输块；
    第一译码单元，用于根据所述第一先验信息和所述第二传输块的第一解调信息，对所述第二传输块进行译码，得到所述第三传输块。
  11. 根据权利要求10所述的装置，其特征在于，所述装置还包括：
    第二译码单元，用于根据所述第一解调信息，对所述第二传输块进行译码，得到第四传输块；
    所述选择单元，还用于如果所述第四传输块和所述第三传输块不相同，从所述先验信息集合中选择第一先验信息。
  12. 根据权利要求11所述的装置，其特征在于，所述装置还包括：
    获取单元，用于获取第一校验信息和第二校验信息，所述第一校验信息为所述第三传输块的校验信息，所述第二校验信息为所述第四传输块的校验信息；
    确定单元，用于如果所述第一校验信息和所述第二校验信息不相同，确定所述第四传输块和所述第三传输块不相同。
  13. 根据权利要求10所述的装置，其特征在于，
    所述第一提取单元，还用于获取所述至少一个第一传输块；
    所述第一提取单元，还用于提取所述至少一个第一传输块中的每个第一传输块中的传输协议层的头信息；
    所述第一提取单元，还用于根据所述至少一个第一传输块中的每个第一传输块中的传输协议层的头信息，生成至少一个先验信息；
    所述第一提取单元，还用于将所述至少一个先验信息组成所述先验信息集合。
  14. 根据权利要求10或13所述的装置，其特征在于，所述装置还包括：
    第二提取单元，用于从所述第三传输块中提取先验信息；
    更新单元，用于根据提取的先验信息，更新所述先验信息集合。
  15. 根据权利要求10-13任一所述的装置，其特征在于，
    所述第一译码单元，还用于根据所述第一先验信息，对所述第一解调信息进行饱和处理，得到第二解调信息；
    所述第一译码单元，还用于根据所述第二解调信息，对所述第二传输块进行译码，得到所述第三传输块。
  16. 根据权利要求15所述的装置，其特征在于，
    所述第一译码单元，还用于根据所述第二解调信息，对所述第二传输块进行译码，得到第五传输块；
    所述第一译码单元，还用于如果所述第五传输块和所述第三传输块不同，从所述先验信息集合中选择第二先验信息，所述第二先验信息为所述先验信息集合中除所述第一先验信息以外的任一先验信息；
    所述第一译码单元，还用于根据所述第二先验信息和所述第一解调信息，对所述第二传输块进行译码，得到所述第三传输块。
  17. 根据权利要求10所述的装置，其特征在于，所述第二传输块为所述发送端对所述第三传输块进行加密得到的数据块；
    所述选择单元，还用于从所述先验信息集合中选择第三先验信息，所述第三先验信息为所述接收端从加密后的第一传输块中提取的先验信息；
    所述选择单元，还用于根据第六传输块，确定第一加密密钥，所述第六传输块为所述第二传输块的上一个译码成功的传输块；
    所述选择单元，还用于通过所述第一加密密钥，对所述第三先验信息进行加密，得到所 述第一先验信息。
  18. 根据权利要求17所述的装置，其特征在于，
    所述选择单元，还用于从所述第六传输块中提取第二加密密钥；
    所述选择单元，还用于根据所述第二加密密钥和预设密钥算法，确定所述第一加密密钥。
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