WO2018163433A1 - Dispositif de communication et procédé de décodage - Google Patents

Dispositif de communication et procédé de décodage Download PDF

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Publication number
WO2018163433A1
WO2018163433A1 PCT/JP2017/009846 JP2017009846W WO2018163433A1 WO 2018163433 A1 WO2018163433 A1 WO 2018163433A1 JP 2017009846 W JP2017009846 W JP 2017009846W WO 2018163433 A1 WO2018163433 A1 WO 2018163433A1
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Prior art keywords
information
decoding
encoding
rnti
bit
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PCT/JP2017/009846
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English (en)
Japanese (ja)
Inventor
洋介 佐野
聡 永田
ホイリン ジャン
ジュンシン ワン
スウネイ ナ
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株式会社Ｎｔｔドコモ
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Priority to PCT/JP2017/009846 priority Critical patent/WO2018163433A1/fr
Publication of WO2018163433A1 publication Critical patent/WO2018163433A1/fr

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    • 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
    • H03M13/03—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
    • H03M13/05—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits
    • H03M13/09—Error detection only, e.g. using cyclic redundancy check [CRC] codes or single parity bit
    • 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
    • H03M13/03—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
    • H03M13/05—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits
    • H03M13/13—Linear codes

Definitions

  • the present invention relates to a communication apparatus used as a user apparatus or a base station in a wireless communication system.
  • a wireless communication system called 5G is being studied to achieve further increases in system capacity, higher data transmission speed, lower delay in the wireless section, etc. Is progressing.
  • 5G various wireless technologies are being studied in order to satisfy the requirement to achieve a delay of 1 ms or less while achieving a throughput of 10 Gbps or more. Since there is a high possibility that a wireless technology different from LTE will be adopted in 5G, in 3GPP, a wireless network supporting 5G is referred to as a new wireless network (NR: New Radio). Distinguish.
  • NR New Radio
  • eMBB extended Mobile Broadband
  • mMTC massive Machine Type Communication
  • URLLC Ultra Reliability and Low Latency Communication
  • eMBB requires higher speed and larger capacity
  • mMTC requires a large number of terminals and low power consumption
  • URLLC requires high reliability and low delay.
  • Non-Patent Document 1 There is a Polar code as a candidate that can realize the above requirement (Non-Patent Document 1).
  • the Polar code is an error correction code capable of realizing a characteristic asymptotic to the Shannon limit based on the concept of channel polarization.
  • SCD successive removal decoding method
  • SCLD sequential removal list decoding method
  • CRC Cyclic Redundancy Check
  • the base station can add a CRC (hereinafter referred to as “CRC” to mean a check value) to the downlink control information, and mask the CRC with an RNTI (Radio Network Temporary Identifier).
  • CRC Radio Network Temporary Identifier
  • the information is encoded and the information is transmitted to the user apparatus.
  • the user apparatus that has received the information determines whether the received information is information addressed to the user apparatus itself by performing determination using a CRC unmasked by the RNTI that the user apparatus itself has in the decoding process of the information. Make a decision.
  • the identifiers such as the Polar code and the RNTI are used not only for downlink communication from the base station to the user apparatus, but also for uplink communication from the user apparatus to the base station and for side link communication between the user apparatuses. It is assumed that it will be used. That is, the above problems may occur not only in downlink communication from the base station to the user apparatus, but also in uplink communication from the user apparatus to the base station and side link communication between the user apparatuses.
  • User devices and devices such as base stations are collectively referred to as communication devices.
  • the present invention has been made in view of the above points.
  • a wireless communication system that transmits encoded information to which a predetermined identifier is applied from the transmission side and detects information using the predetermined identifier on the reception side. Therefore, it is an object of the present invention to provide a technique that makes it possible to obtain a good false detection rate on the receiving side.
  • a communication device used in a wireless communication system An encoding unit that performs predetermined encoding on the input known bit value, information bit value, and padding bit value to generate encoded information; A transmission unit that creates a transmission signal from the encoding information generated by the encoding unit and transmits the transmission signal, and The padding bit value is a value converted into a predetermined identifier by the encoding, and the predetermined identifier is used for decoding the encoded information in another communication device that receives the transmission signal.
  • a featured communication device is provided.
  • a good error is detected on the reception side.
  • FIG. It is a block diagram of the radio
  • FIG. It is a block diagram of the radio
  • FIG. It is a figure for demonstrating the example of encoding of a Polar code
  • FIG. 10 is a diagram for describing an encoding process of method 2. It is a figure for demonstrating the decoding process of the method 2, and shows the outline
  • FIG. 11 is a diagram for explaining a decoding process of method 2.
  • FIG. It is a figure which shows the example of a Shorted Polar code
  • movement of encoding. 10 is a diagram for explaining an encoding process of method 3.
  • FIG. 10 is a diagram for explaining a decoding process of method 3.
  • FIG. It is a figure which shows the comparison between methods. It is a figure for demonstrating an effect.
  • 3 is a diagram illustrating an example of a functional configuration of a user device 10.
  • FIG. 2 is a diagram illustrating an example of a functional configuration of a base station 20.
  • FIG. It is a figure which shows an example of the hardware constitutions of the user apparatus 10 and the base station 20.
  • existing technology can be used as appropriate.
  • the existing technology is, for example, existing LTE, but is not limited to existing LTE.
  • a Polar code is used, but this is only an example.
  • the present invention can be applied to other than the Polar code as long as it can transmit a known bit such as a frozen bit and sequentially decodes the received signal based on the likelihood of the received signal. It is.
  • the present invention can be applied to each of an LDPC (LOW DENCITY PARITY CHECK) code and a convolutional code.
  • the Polar code used in the present embodiment may be called by another name.
  • CRC CRC is used as an example of the error detection code, but the error detection code applicable to the present invention is not limited to CRC.
  • the target of encoding / decoding is control information.
  • the present invention can also be applied to information other than control information.
  • RNTI is used as an identifier, but the present invention is also applicable to identifiers other than RNTI.
  • RNTI is used as an example of means for identifying a signal transmitted to the user apparatus toward itself, but this is only an example.
  • the present invention is applicable not only to RNTI but also to other identifiers such as a user ID unique to the user apparatus.
  • the identifier may be assigned for each user device or may be assigned for each of a plurality of user devices. Alternatively, it may be determined in advance by specifications.
  • downlink communication is shown as a main example, but the present invention can be similarly applied to uplink communication and side link communication.
  • FIG. 1A and 1B are configuration diagrams of a radio communication system according to the present embodiment.
  • the radio communication system according to the present embodiment illustrated in FIG. 1A includes a user apparatus 10 and a base station 20.
  • a user apparatus 10 and a base station 20 are shown, but this is an example, and there may be a plurality of each.
  • the user device 10 is a communication device having a wireless communication function such as a smartphone, a mobile phone, a tablet, a wearable terminal, a communication module for M2M (Machine-to-Machine), and is wirelessly connected to the base station 20 and wireless communication system Use various communication services provided by.
  • the base station 20 is a communication device that provides one or more cells and wirelessly communicates with the user device 10.
  • the duplex method may be a TDD (Time Division Duplex) method or an FDD (Frequency Division Duplex) method.
  • the base station 20 encodes information obtained by adding CRC to downlink control information (DCI: Downlink Control Information) using a Polar code, and performs downlink control on the encoded information. It transmits using a channel (example: PDCCH (Physical Downlink Control Channel)).
  • DCI Downlink Control Information
  • PDCCH Physical Downlink Control Channel
  • the user apparatus 10 decodes information encoded by the Polar code by a sequential removal decoding method (SCD: Successive Canceling Decoding) or the like.
  • SCD Successive Canceling Decoding
  • a Polar code may be applied to the uplink control information.
  • the user apparatus 10 encodes information obtained by adding CRC to uplink control information (UCI: Uplink Control Information) using a Polar code, and encodes the encoded information to an uplink control channel (example: It transmits using PUCCH (Physical Uplink Control Channel).
  • the base station 20 decodes information encoded by the Polar code by, for example, a sequential removal decoding method (SCD: Successive Canceling Decoding) or the like.
  • FIG. 1B shows a case where side link communication is performed between user apparatuses as another example of the wireless communication system according to the present embodiment.
  • the user apparatus 10 encodes information obtained by adding CRC to control information (SCI: Sidelink Control Information) using the Polar code, and encodes the encoded information. It transmits using a control channel (example: PSCCH (Physical Sidelink Control Channel)).
  • the user apparatus 15 decodes the information encoded by the Polar code by, for example, a sequential removal decoding method (SCD: Successive Canceling Decoding) or the like. The same applies to communication from the user device 15 to the user device 10.
  • SCI Sidelink Control Information
  • PSCCH Physical Sidelink Control Channel
  • FIG. 2 shows a Polar code encoder in the case of three repetitions. As shown in FIG. 2, the encoder has a configuration in which communication paths are coupled by exclusive OR.
  • the encoded bits output from the encoder are N bits (x 0 ,..., X N ⁇ 1 ).
  • Polar encoding can be expressed by the following equation, and the following matrix G corresponds to the encoder portion of FIG.
  • the frozen bit may be any bit as long as it is a known bit on the transmission side and the reception side, but 0 is often used.
  • the likelihood (specifically, for example, log-likelihood ratio (LLR)) obtained by demodulation for each bit is input to the decoder on the receiving side, and the likelihood is calculated.
  • LLR log-likelihood ratio
  • the likelihood of each transmission bit is calculated, and the bit value is determined based on the likelihood.
  • the decoding result is the value of the frozen bit.
  • 3 to 5 show examples of sequential calculation.
  • Decoding of u 0 , u 1 , and u 2 is performed by the steps shown in FIGS.
  • f is a calculation that does not directly use known information (bit values for which decoding results have already been obtained, frozen bit values)
  • g is a calculation that uses known information.
  • u 0 to decode the u i, ..., u i- 1 is required to be known. Therefore, u 0 , u 1 , u 2. It is necessary to decrypt in this order.
  • method 1, method 2, and method 3 will be described as encoding and decoding methods in the present embodiment.
  • method 3 is the main method according to the present invention, since method 1 and / or method 2 can be combined with method 3, method 1 and method 2 are also methods according to the present embodiment. explain. Note that the present invention is not limited to the method 3.
  • each method it is assumed that downlink communication in which downlink control information is transmitted from the base station 20 to the user apparatus 10, but uplink communication from the user apparatus 10 to the base station 10 and user
  • the same methods as the encoding and decoding methods 1 to 3 described below can be applied to the side link communication between devices.
  • the target to which each method is applied is not limited to control information.
  • target information information to be encoded such as downlink control information
  • info abbreviation of information
  • frozen bit is written as “frozen”.
  • FIG. 6A shows an outline of the processing flow in the base station 20.
  • the base station 20 adds a CRC to the target information and masks the CRC with the RNTI (step S1).
  • the masking in the present embodiment is to take exclusive OR for each bit. Masking may be called scramble.
  • the RNTI is an identifier for identifying a user apparatus and / or a channel, and there are various types (Non-Patent Document 3).
  • C-RNTI is an RNTI for transmitting / receiving user data
  • SPS Semi Persistent Scheduling
  • P-RNTI is used for paging.
  • the RNTI is for transmitting / receiving
  • the SI-RNTI is an RNTI for transmitting / receiving broadcast information (broadcast system information).
  • the base station 20 selects an RNTI according to the current operation and uses it for masking.
  • the base station 20 performs Polar encoding on the information obtained in Step S1 (Step S2), and performs rate matching on the encoded information by puncturing or the like (Step S3).
  • a transmission signal is created from the encoded information that has undergone the rate matching, and the transmission signal is transmitted wirelessly.
  • the base station 20 adds a CRC to the information composed of the frozen bit and the target information, and masks the RNTI on the CRC.
  • a CRC masked with RNTI is represented as CRC ′.
  • the base station 20 may calculate the CRC from only the target information, or may calculate from the information including the frozen bit and the target information.
  • the base station 20 encodes the “frozen bit + target bit + CRC ′” generated as described above to obtain a code block.
  • FIG. 7A shows an outline of the flow of processing in the user apparatus 10.
  • the user apparatus 10 demodulates a signal received in the PDCCH search space and performs a decoding process (step S11), applies an RNTI to the information obtained by the decoding process, and performs a CRC check (step S12). ). If the CRC check is OK, the user device 10 uses the obtained target information.
  • the decoding operation will be described in more detail with reference to FIG. 7B.
  • the user apparatus 10 decodes the code block received from the base station 20. Then, CRC ′ is unmasked with RNTI, and CRC check is performed using the obtained CRC. When the CRC check is OK, it is determined that the target information is the target information addressed to the user device 10, and the target information is used. Further, the user apparatus 10 can determine the type of channel (data) based on the type of RNTI that has succeeded in the CRC check.
  • the user apparatus 10 may use only the SCD for decoding, may use a sequential removal list decoding method (SCLD: Successive Cancellation List Decoding), or a sequential removal list decoding method using CRC (CRC-aided SCLD). May be used.
  • SCLD Successive Cancellation List Decoding
  • CRC CRC-aided SCLD
  • the user apparatus 10 uses the L sequence with the highest likelihood as the surviving path (L is called a list size), and sets the sequence with the highest likelihood as the decoding result. I do.
  • RNTI is applied to each L sequence and CRC check is performed, and the sequence that succeeded in the CRC check is used as the decoding result.
  • FIG. 8A shows an overview of the flow of processing in the base station 20.
  • the base station 20 calculates the CRC and adds the CRC to the target information (step S21).
  • the base station 20 performs Polar encoding on the information in which the RNTI is applied to the frozen bit (Step S22), and performs rate matching on the encoded information by puncturing or the like (Step S23).
  • a transmission signal is created from the encoded information that has undergone the rate matching, and is transmitted wirelessly.
  • the base station 20 adds a frozen bit to “target information + CRC” in the process of Polar encoding.
  • the base station 20 creates “target information + frozen bit” before adding a CRC, calculates a CRC from “target information + frozen bit”, and adds the CRC to “target information + frozen bit”. It is good.
  • the base station 20 masks the RNTI on the portion of the frozen bit in the “target information + CRC + frozen bit”. For example, when the bit length of the frozen bit is the same as that of the RNTI and the frozen bits are all 0, the frozen bit after RNTI masking is the same bit as the RNTI.
  • the bit length of the frozen bit and the bit length of the RNTI may be different.
  • the bit length of RNTI is 4 bits, the values thereof are (a 0 , a 1 , a 2 , a 3 ), the bit length of the frozen bits is 8 bits, and the values are all 0. .
  • the base station 20 masks the frozen bit using “RNTI + RNTI”, and uses (a 0 , a 1 , a 2 , a 3 , a 0 , a 1 , a 2 , a 3) obtain.
  • it is known in the user apparatus 10 to use “RNTI + RNTI” for masking (use a connected RNTI).
  • the use of “RNTI + RNTI” may be notified from the base station 20 to the user apparatus 10 by higher layer signaling or broadcast information.
  • the base station 20 shortens the RNTI by applying a hash function to the RNTI so that it has the same length as the frozen bit.
  • the shortened RNTI is used for masking. It is known in the user apparatus 10 to use RNTI in which a hash function is applied to masking. Or it is good also as notifying to the user apparatus 10 from the base station 20 by higher layer signaling or broadcast information using RNTI which applied the hash function to masking.
  • the base station 20 encodes the “target information + CRC + frozen ′” generated as described above to obtain a code block.
  • RNTI bits (a 0 , a 1 , a 2 , a 3 ) are input to the encoder as frozen bits to which RNTI is applied, and information bits are input to the encoder.
  • the information bits here are “target information + CRC”.
  • x 0 ′ and x 1 ′ are punctured, and the remaining 6 bits are transmitted through resource mapping or the like. Puncturing is used, for example, to match the number of bits to be transmitted with the amount of transmission resources. Further, there are various existing methods (eg, QUP (quasi-uniform puncturing)) regarding the puncturing method of the Polar code, such as how to determine the puncturing bit, and this method can be used.
  • QUP quadsi-uniform puncturing
  • FIG. 10A shows an outline of the flow of processing in the user apparatus 10.
  • the user apparatus 10 demodulates a signal received in the PDCCH search space, and performs decoding processing using the RNTI on the obtained information (code block) (step S31).
  • a CRC check is performed on (step S32).
  • the decoding operation will be described in more detail with reference to FIG. 10B.
  • the frozen bit (frozen ') on the encoding side is the RNTI itself and is known in the user apparatus 10. Therefore, the user apparatus 10 performs the decoding process on the assumption that the frozen bit is RNTI. Thereafter, a CRC check is performed, and when the CRC check is OK, it is determined that the target information is the target information addressed to the user device 10, and the target information is used. Also, the type of channel (data) can be determined based on the type of RNTI that has been successfully CRC checked. Also in the method 2, as in the method 1, the user apparatus 10 may use SCD in decoding, SCLD, or CRC-aided SCLD.
  • RNTI is used as a frozen bit.
  • known (frozen bits or decoded bits) values u 0 ,..., U i ⁇ 1 are used. Therefore, in the decoding process shown in FIG. 11, a 0 , a 1 , and a 2 are used to decode u 3 , and when u 5 , u 6 , and u 7 are decoded, a 0 , a 1 , a 2 and a 3 are used.
  • the user apparatus 10 when there are a plurality of types of RNTIs that can be used by the base station 20, the user apparatus 10 performs decoding processing using each RNTI as a frozen bit and is used for a result of successful CRC check. It can be determined that the RNTI is the RNTI applied in the base station 20. For example, when the user apparatus 10 performs the decoding process and the CRC check using each of P-RNTI and SI-RNTI, and the user apparatus 10 succeeds in the CRC check when using the SI-RNTI, the user apparatus 10 It can be determined that broadcast information is received from the base station 20.
  • Method 3 a Shorted Polar code in which the length of input bits (information bits + frozen bits) is shortened is used on the encoding side.
  • FIG. 12 shows an example of encoding with the Shorted Polar code.
  • the number of information bits + freeze bits is 6 bits for an encoder that inputs 8 bits. In this case, 2 bits are used as padding bits.
  • the encoded bits corresponding to the padding bits are punctured.
  • the decoding processing is performed with the likelihood of the punctured bit as a likelihood (eg, + ⁇ ) indicating 0, for example.
  • the punctured bits are known at the receiving side.
  • FIG. 13A shows an overview of the processing flow in the base station 20.
  • the base station 20 calculates a CRC for the target information and adds the CRC to the target information (step S41).
  • the base station 20 adds padding bits, performs Polar encoding (step S42), and performs rate matching (shortening) on the encoded information by puncturing (step S43).
  • a transmission signal is created from the encoded information that has undergone the rate matching, and is transmitted wirelessly.
  • the base station 20 adds a frozen bit to “target information + CRC” in the process of Polar encoding.
  • the base station 20 creates “frozen bit + target information” before adding CRC, calculates CRC from “frozen bit + target information”, and adds the CRC to “frozen bit + target information”. It is good.
  • the base station 20 adds a padding bit to “frozen bit + target information + CRC”.
  • the padding bits in this embodiment are bits that become RNTI as a result of encoding. That is, the padding bits are obtained by applying an inverse function of encoding to RNTI.
  • the bit length of the padding bits and the bit length of the RNTI may be the same or different.
  • the bit length of the padding bit is longer than the bit length of the RNTI, for example, information obtained by concatenating a plurality of RNTIs (for example, RNTI + RNTI) is used as the RNTI to generate padding bits and a decoding process described later Is done.
  • the bit length of the padding bit is shorter than the bit length of the RNTI, for example, by applying a hash function to the RNTI, the RNTI is shortened, and the shortened RNTI is used as the RNTI to generate padding bits. And the decoding process mentioned later is performed.
  • Padding bits are known in the user device 10. Specifically, the user apparatus 10 holds the same inverse function as the inverse function held by the base station 20, and calculates padding bits from the RNTI using the inverse function. Alternatively, the base station 20 may notify the user apparatus 10 of the inverse function used by the base station 20 by higher layer signaling or broadcast information.
  • the base station 20 may notify the user apparatus 10 by higher layer signaling or broadcast information.
  • the base station 20 encodes “frozen bit + target information + CRC + padding bit” to obtain encoded information.
  • the encoded information includes a code block that is encoded information of “frozen bits + target information + CRC” and RNTI that is encoded information of padding bits.
  • the base station 20 punctures the RNTI in the rate matching process. For this reason, in FIG. 12, the corresponding part is described as shorted.
  • the frozen bits (u 0 , u 1 ), the information bits (u 2 to u 5 ), and the padding bits (u 6 , u 7 ) are input to the encoder, and the encoded bits are output.
  • the information bit corresponds to “target information + CRC”.
  • the coded bits (x 6 , ′, x 7 ′) corresponding to the padding bits (u 6 , u 7 ) are RNTI.
  • the RNTI bits are punctured, and the remaining 6 bits are transmitted through resource mapping or the like.
  • FIG. 15A shows an overview of the processing flow in the user apparatus 10.
  • the user apparatus 10 demodulates a signal received in a PDCCH search space, and performs decoding processing on the obtained information (likelihood for each bit) using RNTI. (Step S51), and CRC check is performed on the obtained information (step S52).
  • a frozen bit value and a padding bit value are also used as known information.
  • the decoding operation will be described in more detail with reference to FIGS. 15B and 16.
  • the bit obtained by encoding from the padding bits is RNTI, and it is punctured.
  • the user apparatus 10 performs a decoding process using the RNTI as the value of the punctured bit (shorted portion in FIG. 15B) among the received bits. Thereafter, a CRC check is performed, and when the CRC check is OK, it is determined that the target information is the target information addressed to the user device 10, and the target information is used. Also, the type of channel (data) can be determined based on the type of RNTI that has been successfully CRC checked. Also in the method 3, similarly to the methods 1 and 2, the user apparatus 10 may use SCD in decoding, SCLD, or CRC-aided SCLD.
  • the likelihood of each bit is input as an input to the decoder (right side in FIG. 16).
  • the likelihood indicating the value of RNTI is used. For example, if the bit value is 0, a large positive value (eg, + ⁇ ) is used as the likelihood. If the bit value is 1, a negative large value (eg, ⁇ ) is used as the likelihood.
  • the user apparatus 10 performs a decoding process using known information as the frozen bit value (u 0 , u 1 ) and the padding bit value (u 6 , u 7 ) on the output side.
  • the user apparatus 10 when there are a plurality of types of RNTI that can be applied in the base station 20, the user apparatus 10 performs a decoding process for each of the plurality of RNTIs using each likelihood corresponding to each bit of the RNTI as an input.
  • the CRC check is successful, it can be determined that the used RNTI is the RNTI applied in the base station 20.
  • the user apparatus 10 performs the decoding process and the CRC check using each of P-RNTI and SI-RNTI, and the user apparatus 10 succeeds in the CRC check when using the SI-RNTI, the user apparatus 10 It can be determined that broadcast information is received from the base station 20.
  • all bits corresponding to the RNTI are punctured on the transmission side, but this is an example. A part of all the bits corresponding to the RNTI may be punctured, or any of the bits corresponding to the RNTI may not be punctured. Even when puncturing is not performed, the decoding processing shown in FIG. 16 can be performed.
  • a value obtained by applying an inverse function to RNTI may be used as a value used as an input of likelihood on the decoding side, using RNTI for padding bits.
  • the base station 20 may combine the method 1 and / or the method 2 in the encoding process of the method 3, for example.
  • the base station 20 masks the RNTI on the CRC and / or frozen bit shown in FIG. 13B.
  • the user apparatus 10 performs a decoding process using the RNTI as the frozen bit.
  • the user apparatus 10 performs CRC check after unmasking the CRC portion obtained by the decoding process using the RNTI.
  • FIG. 17 shows the features of Method 1 to Method 3.
  • Method 1 RNTI is applied to CRC, and unmasking is performed using RNTI after decoding.
  • Method 2 the RNTI is applied to the frozen bit and the RNTI is used before decoding.
  • Method 3 RNTI is applied to padding bits, and RNTI is used before decoding.
  • FAR False Alarm Rate, false detection rate
  • CRC length in Method 1
  • more CRC bits are required to obtain a better FAR, and overhead increases.
  • the false detection rate can be reduced without increasing overhead, but the characteristics may be unstable or not robust.
  • the false detection rate can be reduced depending on the length of the padding bits. Note that some of the frozen bits may be padding bits, and the overhead in Method 3 can be reduced.
  • FIG. 18 shows the FAR evaluation results of Method 2 and Method 3.
  • “Frozen RNTI” indicates method 2
  • “Shortened RNTI” indicates method 3.
  • the horizontal axis in FIG. 18 is Es / N0 (signal to noise ratio), and the vertical axis is FAR.
  • FAR is better in method 3 than in method 2.
  • the method 3 can identify them better than the method 2.
  • Method 1 is similar to the existing LTE method, it is considered that implementation is relatively easy. Further, in Method 2, since RNTI is applied to the frozen bit, it is not necessary to add padding bits, and CRC unmasking or the like is unnecessary on the decoding side. Therefore, it can be considered that the processing load is low in these respects. As described above, the method 3 has an effect that a good FAR can be obtained.
  • FIG. 19 is a diagram illustrating an example of a functional configuration of the user device 10.
  • the user apparatus 10 includes a signal transmission unit 101, a signal reception unit 102, and a setting information management unit 103.
  • the functional configuration shown in FIG. 19 is merely an example. As long as the operation according to the present embodiment can be executed, the function classification and the name of the function unit may be anything.
  • the signal transmission unit 101 creates a transmission from the transmission data and transmits the transmission signal wirelessly.
  • the signal receiving unit 102 wirelessly receives various signals, and acquires higher layer signals from the received physical layer signals.
  • the setting information management unit 103 stores various setting information received from the base station 20 by the signal receiving unit 102, and preset setting information.
  • the contents of the setting information are, for example, one or a plurality of RNTIs, known bit values, and the like. Further, the setting information management unit 103 may store an inverse function used for calculating the value of the padding bit.
  • the signal transmission unit 101 includes an encoding unit 111 and a transmission unit 121.
  • the encoding unit 111 performs the encoding process of Method 3.
  • the encoding unit 111 is configured to perform encoding (eg, Polar encoding) on the known bit value, the information bit value, and the padding bit value to generate encoded information.
  • the encoding unit 111 has a function of calculating a CRC and including the CRC in the information bit value.
  • the encoding unit 111 may perform the encoding process of the method 1 and / or the method 2 in addition to the encoding process of the method 3.
  • the transmission unit 121 is configured to create a transmission signal from the encoded information generated by the encoding unit 111 and transmit the transmission signal wirelessly. For example, the transmission unit 121 punctures part of the bit values in the encoded information by rate matching, modulates the encoded information that has been punctured, and generates modulation symbols (complex-valued modulation symbols). Is generated. Also, the transmitter 121 maps modulation symbols to resource elements, generates a transmission signal (eg, OFDM signal, SC-FDMA signal), and transmits it from an antenna provided in the transmitter 121. The transmission signal is received by, for example, another communication device (eg, base station 20 or user device 15).
  • another communication device eg, base station 20 or user device 15.
  • the signal transmission unit 101 of the user apparatus 10 may not have a function of performing Polar encoding.
  • the signal receiving unit 102 includes a decoding unit 112 and a receiving unit 122.
  • the receiving unit 122 acquires the likelihood for each bit of the encoded information encoded by encoding (eg, Polar encoding) by demodulating a signal received from another communication apparatus. For example, the receiving unit 122 performs FFT on the received signal obtained by the detection, acquires the signal component of each subcarrier, and obtains the log likelihood ratio for each bit using the QRM-MLD method or the like.
  • encoding eg, Polar encoding
  • the decoding unit 112 decodes encoded information using the likelihood and the likelihood corresponding to a predetermined identifier (eg, RNTI). In addition, the decoding unit 112 performs a check on the information obtained by decoding the encoded information using an error detection code (eg, CRC), and determines that the information is the final decoding result when the check is successful. .
  • a predetermined identifier eg, RNTI
  • CRC error detection code
  • FIG. 20 is a diagram illustrating an example of a functional configuration of the base station 20.
  • the base station 20 includes a signal transmission unit 201, a signal reception unit 202, a setting information management unit 203, and a scheduling unit 204.
  • the functional configuration shown in FIG. 20 is merely an example. As long as the operation according to the present embodiment can be executed, the function classification and the name of the function unit may be anything.
  • the signal transmission unit 201 includes a function of generating a signal to be transmitted to the user apparatus 10 and transmitting the signal wirelessly.
  • the signal receiving unit 202 includes a function of receiving various signals transmitted from the user apparatus 10 and acquiring, for example, higher layer information from the received signals.
  • the setting information management unit 203 stores known setting information, for example.
  • the contents of the setting information are, for example, one or a plurality of RNTIs and known bit values. Further, the setting information management unit 203 may store an inverse function used for calculating the value of the padding bit.
  • the scheduling unit 204 for example, allocates resources (UL communication resource, DL communication resource, or SL communication resource) used by the user apparatus 10, passes the allocation information to the signal transmission unit 201, and the signal transmission unit 201 Downlink control information including the allocation information is transmitted to the user apparatus 10.
  • resources UL communication resource, DL communication resource, or SL communication resource
  • the signal transmission unit 201 includes an encoding unit 211 and a transmission unit 221.
  • the encoding unit 211 performs the encoding process of Method 3.
  • the encoding unit 211 is configured to perform encoding (for example, Polar encoding) on the known bit value, the information bit value, and the padding bit value to generate encoded information.
  • the encoding unit 211 has a function of calculating a CRC and including the CRC in the information bit value.
  • the encoding unit 211 may perform the encoding process of the method 1 and / or the method 2 in addition to the encoding process of the method 3.
  • the transmission unit 221 is configured to create a transmission signal from the encoded information generated by the encoding unit 211 and transmit the transmission signal wirelessly. For example, the transmission unit 221 punctures a part of bit values in the encoded information by rate matching, modulates the punctured encoded information, and modulates (modulated-valued modulation symbols). To get. Also, the transmission unit 221 maps modulation symbols to resource elements, generates a transmission signal (eg, OFDM signal, SC-FDMA signal), and transmits it from an antenna provided in the transmission unit 221. The transmission signal is received by another communication device (eg, user device 10).
  • another communication device eg, user device 10
  • the signal receiving unit 202 includes a decoding unit 212 and a receiving unit 222.
  • the receiving unit 222 acquires the likelihood for each bit of the encoded information encoded by encoding (eg, Polar encoding) by demodulating a signal received from another communication apparatus. For example, the reception unit 222 performs FFT on the reception signal obtained by detection, acquires the signal component of each subcarrier, and obtains the log likelihood ratio for each bit using the QRM-MLD method or the like.
  • the decoding unit 212 decodes encoded information using the likelihood of the received signal and the likelihood corresponding to a predetermined identifier (eg, RNTI). .
  • the decoding unit 212 performs an inspection using an error detection code (eg, CRC) on information obtained by decoding the encoded information, and determines that the information is the final decoding result when the inspection is successful.
  • CRC error detection code
  • the signal receiving unit 202 of the base station 20 may not have a function of performing Polar decoding.
  • each functional block may be realized by one device in which a plurality of elements are physically and / or logically combined, or two or more devices physically and / or logically separated may be directly and directly. It may be realized by a plurality of these devices connected indirectly (for example, wired and / or wirelessly).
  • both the user apparatus 10 and the base station 20 in the embodiment of the present invention may function as a computer that performs processing according to the present embodiment.
  • FIG. 21 is a diagram illustrating an example of a hardware configuration of the user apparatus 10 and the base station 20 according to the present embodiment.
  • Each of the above-described user apparatus 10 and base station 20 may be physically configured as a computer apparatus including a processor 1001, a memory 1002, a storage 1003, a communication apparatus 1004, an input apparatus 1005, an output apparatus 1006, a bus 1007, and the like. Good.
  • the term “apparatus” can be read as a circuit, a device, a unit, or the like.
  • the hardware configurations of the user apparatus 10 and the base station 20 may be configured to include one or a plurality of apparatuses indicated by 1001 to 1006 shown in the figure, or may be configured not to include some apparatuses. May be.
  • Each function in the user apparatus 10 and the base station 20 is performed by causing the processor 1001 to perform computation by reading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, and performing communication by the communication apparatus 1004 and memory 1002. This is realized by controlling reading and / or writing of data in the storage 1003.
  • the processor 1001 controls the entire computer by operating an operating system, for example.
  • the processor 1001 may be configured by a central processing unit (CPU) including an interface with a peripheral device, a control device, an arithmetic device, a register, and the like.
  • CPU central processing unit
  • the processor 1001 reads a program (program code), software module, or data from the storage 1003 and / or the communication device 1004 to the memory 1002, and executes various processes according to these.
  • a program program that causes a computer to execute at least a part of the operations described in the above embodiments is used.
  • the signal transmission unit 101, the signal reception unit 102, and the setting information management unit 103 of the user apparatus 10 illustrated in FIG. 19 may be realized by a control program stored in the memory 1002 and operating on the processor 1001. Further, for example, the signal transmission unit 201, the signal reception unit 202, the setting information management unit 203, and the scheduling unit 204 of the base station 20 illustrated in FIG.
  • the processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via a telecommunication line.
  • the memory 1002 is a computer-readable recording medium, for example, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. May be.
  • the memory 1002 may be called a register, a cache, a main memory (main storage device), or the like.
  • the memory 1002 can store a program (program code), a software module, and the like that can be executed to perform the processing according to the embodiment of the present invention.
  • the storage 1003 is a computer-readable recording medium such as an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (for example, a compact disk, a digital versatile disk, a Blu-ray). (Registered trademark) disk, smart card, flash memory (for example, card, stick, key drive), floppy (registered trademark) disk, magnetic strip, and the like.
  • the storage 1003 may be referred to as an auxiliary storage device.
  • the storage medium described above may be, for example, a database, server, or other suitable medium including the memory 1002 and / or the storage 1003.
  • the communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like.
  • the signal transmission unit 101 and the signal reception unit 102 of the user device 10 may be realized by the communication device 1004.
  • the signal transmission unit 201 and the signal reception unit 202 of the base station 20 may be realized by the communication device 1004.
  • the input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts an input from the outside.
  • the output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs output to the outside.
  • the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).
  • each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information.
  • the bus 1007 may be configured with a single bus or may be configured with different buses between apparatuses.
  • the user apparatus 10 and the base station 20 are respectively a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), an ASIC (Fragable Logic Device), a PLD (Programmable Logic Device), an AFP It may be configured including hardware, and a part or all of each functional block may be realized by the hardware.
  • the processor 1001 may be implemented by at least one of these hardware.
  • a communication device used in a wireless communication system performs predetermined encoding on an input known bit value, information bit value, and padding bit value.
  • An encoding unit that generates encoding information, and a transmission unit that generates a transmission signal from the encoding information generated by the encoding unit and transmits the transmission signal, and the padding bit value is The communication device is a value converted into a predetermined identifier by the encoding, and the predetermined identifier is used for decoding the encoded information in another communication device that receives the transmission signal. Is provided.
  • the transmission unit may puncture the predetermined identifier obtained by the encoding from the encoded information. With this configuration, the number of bits of the transmission signal can be reduced.
  • a communication apparatus used in a wireless communication system which encodes information encoded by predetermined encoding by demodulating a signal received from another communication apparatus.
  • the decoding unit uses, for example, a frozen bit value and a known padding bit value as known bit values used in the decoding. With this configuration, decoding using known information (eg, Polar decoding) can be performed appropriately.
  • known information eg, Polar decoding
  • the decoding unit may check the information obtained by decoding the encoded information using an error detection code, and when the check is successful, determine the information as a final decoding result. With this configuration, it is possible to appropriately determine the correctness of the received information.
  • the operations of a plurality of functional units may be physically performed by one component, or the operations of one functional unit may be physically performed by a plurality of components.
  • the processing order may be changed as long as there is no contradiction.
  • the user apparatus 10 and the base station 20 have been described using functional block diagrams. However, such an apparatus may be realized by hardware, software, or a combination thereof.
  • the software operated by the processor of the user apparatus 10 according to the embodiment of the present invention and the software operated by the processor of the base station 20 according to the embodiment of the present invention are random access memory (RAM), flash memory, and read-only, respectively. It may be stored in any appropriate storage medium such as a memory (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server or the like.
  • the notification of information is not limited to the aspect / embodiment described in the present specification, and may be performed by other methods.
  • the notification of information includes physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (Medium Accu), signaling (MediaColl). It may be implemented by broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof.
  • the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup (RRC Connection Setup) message, an RRC connection reconfiguration (RRC Connection Reconfiguration) message, or the like.
  • Each aspect / embodiment described in this specification includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G, 5G, FRA (Fure Radio Access), and W-CDMA.
  • LTE Long Term Evolution
  • LTE-A Long Term Evolution-Advanced
  • SUPER 3G IMT-Advanced
  • 4G 5G
  • FRA Full Radio Access
  • W-CDMA Wideband
  • GSM registered trademark
  • CDMA2000 Code Division Multiple Access 2000
  • UMB User Mobile Broadband
  • IEEE 802.11 Wi-Fi
  • IEEE 802.16 WiMAX
  • IEEE 802.20 UWB (Ultra-WideBand
  • the present invention may be applied to a Bluetooth (registered trademark), a system using other appropriate systems, and / or a next generation system extended based on these systems.
  • the specific operation assumed to be performed by the base station 20 in the present specification may be performed by the upper node in some cases.
  • various operations performed for communication with the user apparatus 10 may be performed in a manner other than the base station 20 and / or other than the base station 20.
  • a network node for example, but not limited to MME or S-GW.
  • MME and S-GW network nodes
  • User equipment 10 can be used by those skilled in the art to subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, It may also be referred to as a wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other appropriate terminology.
  • Base station 20 may also be referred to by those skilled in the art as NB (NodeB), eNB (enhanced NodeB), base station (Base Station), or some other appropriate terminology.
  • NB NodeB
  • eNB enhanced NodeB
  • Base Station Base Station
  • determining may encompass a wide variety of actions.
  • “Judgment” and “determination” are, for example, judgment (judging), calculation (calculating), calculation (computing), processing (processing), derivation (investigation), investigation (investigating), search (loking up) (for example, table , Searching in a database or another data structure), considering ascertaining “determining”, “determining”, and the like.
  • “determination” and “determination” are reception (for example, receiving information), transmission (for example, transmitting information), input (input), output (output), and access. (Accessing) (for example, accessing data in a memory) may be considered as “determining” or “determining”.
  • determination and “determination” means that “resolving”, selection (selecting), selection (choosing), establishment (establishing), comparison (comparing), etc. are regarded as “determination” and “determination”. May be included. In other words, “determination” and “determination” may include considering some operation as “determination” and “determination”.
  • the phrase “based on” does not mean “based only on”, unless expressly specified otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”

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  • Physics & Mathematics (AREA)
  • Probability & Statistics with Applications (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un dispositif de communication utilisé dans un système de communication sans fil, et doté de : une unité de codage qui génère des informations codées en effectuant un codage prédéfini par rapport à une valeur de bit connue entrée, une valeur de bit d'information et une valeur de bit de remplissage ; et une unité de transmission qui crée un signal de transmission à partir des informations codées générées par l'unité de codage, et transmet le signal de transmission, la valeur de bit de remplissage étant une valeur à convertir en un identifiant prédéfini par le codage, et l'identifiant prédéfini étant utilisé pour décoder les informations codées dans un autre dispositif de communication qui reçoit le signal de transmission.
PCT/JP2017/009846 2017-03-10 2017-03-10 Dispositif de communication et procédé de décodage WO2018163433A1 (fr)

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CN111200442A (zh) * 2018-11-20 2020-05-26 华为技术有限公司 编译码方法、编码译码装置以及系统

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