WO2018163433A1

WO2018163433A1 - Communication device and decoding method

Info

Publication number: WO2018163433A1
Application number: PCT/JP2017/009846
Authority: WO
Inventors: 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
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2017-03-10
Filing date: 2017-03-10
Publication date: 2018-09-13

Abstract

A communication device is used in a wireless communication system, and is provided with: a coding unit that generates coded information by performing predetermined coding with respect to an inputted known bit value, an information bit value and a padding bit value; and a transmission unit that creates a transmission signal from the coded information generated by the coding unit, and transmits the transmission signal, wherein the padding bit value is a value to be converted into a predetermined identifier by the coding, and the predetermined identifier is used to decode the coded information in another communication device that receives the transmission signal.

Description

Communication apparatus and decoding method

The present invention relates to a communication apparatus used as a user apparatus or a base station in a wireless communication system.

In 3GPP (3rd Generation Partnership Project), 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. In 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.

In 5G, there are three main use cases: eMBB (extended Mobile Broadband), mMTC (massible Machine Type Communication), and URLLC (Ultra Reliability and Low Latency Communication).

For example, eMBB requires higher speed and larger capacity, whereas mMTC requires a large number of terminals and low power consumption, and URLLC requires high reliability and low delay. In order to realize these requirements, it is necessary to satisfy these requirements even in channel coding which is indispensable in mobile communication.

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. Further, by using a simple successive removal decoding method (SCD) as a Polar code decoding method, it is possible to realize excellent characteristics with low calculation amount and low power consumption. Also, as a decoding method of the Polar code, a sequential removal list decoding method (SCLD: Successive Cancellation List Decoding) with improved SCD characteristics, and a sequential removal list decoding method using CRC (Cyclic Redundancy Check) with further improved characteristics. (CRC-aided SCLD) is known (Non-Patent Document 2). In CRC-aided SCLD, a plurality of sequences (bit sequences) with high likelihood are obtained, and one sequence that succeeds in CRC determination is selected as a final decoding result.

In NR, it is assumed that a Polar code is applied to a downlink control channel (Downlink Control Channel).

In the existing LTE, 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). 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.

However, it is not clear how to apply RNTI when using a Polar code that is not used in the existing LTE. Depending on the application method of the RNTI, the user apparatus erroneously recognizes that the control information addressed to itself is not correct control information (that is, CRC check failure), or the control information that is not addressed to itself is addressed to itself. It is possible that the possibility that the control information is erroneously recognized as the control information will increase. These possibilities are called false alarm rates. This may also be called a false detection rate.

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.

According to the disclosed technology, 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.

According to the disclosed technique, in a wireless communication system in which encoded information to which a predetermined identifier is applied is transmitted from the transmission side and information is detected using the predetermined identifier on the reception side, a good error is detected on the reception side. A technique is provided that makes it possible to obtain a detection rate.

It is a block diagram of the radio | wireless communications system in embodiment of this invention, and shows the structure which has the base station 20 and the user apparatus 10. FIG. It is a block diagram of the radio | wireless communications system in embodiment of this invention, and shows the structure which has the user apparatus 10 and the user apparatus 15. FIG. It is a figure for demonstrating the example of encoding of a Polar code | symbol. It is a figure for demonstrating the example of decoding of a Polar code. It is a figure for demonstrating the example of decoding of a Polar code. It is a figure for demonstrating the example of decoding of a Polar code. It is a figure for demonstrating the encoding process of the method 1, and shows the outline | summary of the flow of a process. It is a figure for demonstrating the encoding process of the method 1, and shows the operation | movement of encoding. It is a figure for demonstrating the decoding process of the method 1, and shows the outline | summary of the flow of a process. It is a figure for demonstrating the decoding process of the method 1, and shows the operation | movement of decoding. It is a figure for demonstrating the encoding process of the method 2, and shows the outline | summary of the flow of a process. It is a figure for demonstrating the encoding process of the method 2, and shows the operation | movement of encoding. 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 | summary of the flow of a process. It is a figure for demonstrating the decoding process of the method 2, and shows the operation | movement of decoding. 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 | symbol. It is a figure for demonstrating the encoding process of the method 3, and shows the outline | summary of the flow of a process. It is a figure for demonstrating the encoding process of the method 3, and shows the operation | movement of encoding. 10 is a diagram for explaining an encoding process of method 3. FIG. It is a figure for demonstrating the decoding process of the method 3, and shows the outline | summary of the flow of a process. It is a figure for demonstrating the decoding process of the method 3, and shows the operation | movement of decoding. 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.

Hereinafter, an embodiment (this embodiment) of the present invention will be described with reference to the drawings. The embodiment described below is only an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

In the actual operation of the wireless communication system of the present embodiment, existing technology can be used as appropriate. The existing technology is, for example, existing LTE, but is not limited to existing LTE.

In the embodiments described below, terms such as PDCCH, DCI, and RNTI used in the existing LTE are used for the convenience of description. Functions etc. may be called by other names.

In this embodiment, a Polar code is used, but this is only an example. As in the case of the Polar code, 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. For example, the present invention can be applied to each of an LDPC (LOW DENCITY PARITY CHECK) code and a convolutional code. Further, the Polar code used in the present embodiment may be called by another name.

In this embodiment, 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. In this embodiment, the target of encoding / decoding is control information. However, the present invention can also be applied to information other than control information. In this embodiment, RNTI is used as an identifier, but the present invention is also applicable to identifiers other than RNTI.

In this embodiment, 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.

Further, in the present embodiment, downlink communication is shown as a main example, but the present invention can be similarly applied to uplink communication and side link communication.

(Whole system configuration)
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. In FIG. 1, one user apparatus 10 and one 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. In the present embodiment, the duplex method may be a TDD (Time Division Duplex) method or an FDD (Frequency Division Duplex) method.

In the configuration shown in FIG. 1A, for example, 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)). The user apparatus 10 decodes information encoded by the Polar code by a sequential removal decoding method (SCD: Successive Canceling Decoding) or the like.

Further, a Polar code may be applied to the uplink control information. In this case, for example, 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. When applying the Polar code in the side link, for example, 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.

(About Polar code)
In this embodiment, since a Polar code is used, encoding and decoding of the Polar code will be described. Since the method of encoding and decoding the Polar code itself is well known, only the outline will be described below (refer to Non-Patent Document 1 for details).

In the Polar code, a combination of a plurality of channels and separation (Combine, Split) are repeated and converted into a polarized communication path, thereby separating the channel into a good quality channel and a bad channel. An information bit is assigned to a channel with good quality, and a frozen bit that is a known signal is assigned to a channel with poor quality. 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 input to the Polar encoder is N = 2 ⁿ bits of u ₀ ,..., U _N−1 . If K bits (v ₀ ,..., V _K−1 ) are information bits, (NK) bits become frozen bits. The encoded bits output from the encoder are N bits (x ₀ ,..., X _N−1 ). FIG. 2 shows an example where N = 8 and K = 4. In the description of this embodiment, “bit” may be used to mean a bit value.

Also, 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.

Next, a successive cancellation decoding (SCD) will be described as a basic method for decoding a Polar code. In the successive removal decoding method, 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. by successively performing a predetermined calculation for a transmission bit, sequentially decode in order from u _0. Specifically, the likelihood of each transmission bit is calculated, and the bit value is determined based on the likelihood. However, for the frozen bit, 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. In the figure, f is a calculation that does not directly use known information (bit values for which decoding results have already been obtained, frozen bit values), and g is a calculation that uses known information. In decoding Polar codes, _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.

Hereinafter, method 1, method 2, and method 3 will be described as encoding and decoding methods in the present embodiment. Although 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.

Further, in the following description of 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.

Hereinafter, information to be encoded such as downlink control information is referred to as “target information”. In each figure, the target information is expressed as “info” (abbreviation of information). In addition, the frozen bit is written as “frozen”.

(Method 1)
<Encoding of Method 1>
The encoding process in the method 1 will be described with reference to FIGS. 6A and 6B. FIG. 6A shows an outline of the processing flow in the base station 20. Similarly to the existing LTE, the base station 20 adds a CRC to the target information and masks the CRC with the RNTI (step S1). Note that 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). For example, C-RNTI is an RNTI for transmitting / receiving user data, SPS (Semi Persistent Scheduling) -RNTI is an RNTI for transmitting / receiving data in SPS, and P-RNTI is used for paging. The RNTI is for transmitting / receiving, and 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 encoding operation will be described in more detail with reference to FIG. 6B. As shown in FIG. 6B, 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 ′. Note that 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.

<Decoding method 1>
The decoding process in Method 1 will be described with reference to FIGS. 7A and 7B. FIG. 7A shows an outline of the flow of processing in the user apparatus 10. For example, 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.

When SCLD is used, 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.

Also, when CRC-aided SCLD is used, 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.

(Method 2)
<Encoding of Method 2>
The encoding process in the method 2 will be described with reference to FIGS. 8A, 8B, and 9. 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 encoding operation will be described in more detail with reference to FIG. 8B. 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.

Then, 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. For example, it is assumed that 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. . In this case, for example, 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. In this case, it is known in the user apparatus 10 to use “RNTI + RNTI” for masking (use a connected RNTI). Alternatively, 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.

Further, when the bit length of the RNTI is longer than the bit length of the frozen bit, for example, 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.

As shown in FIG. 8B, the base station 20 encodes the “target information + CRC + frozen ′” generated as described above to obtain a code block.

FIG. 9 shows an encoding process when N = 8 and NK = 4. As shown in FIG. 9, 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”.

In the example shown in FIG. 9, among the 8 encoded bits, 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.

<Decoding method 2>
Next, the decoding process in the method 2 will be described with reference to FIGS. 10A, 10B, and 11. FIG. 10A shows an outline of the flow of processing in the user apparatus 10. For example, 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. Here, it is assumed that 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.

FIG. 11 shows a decoding process corresponding to the encoding process (N = 8, NK = 4) in FIG. As shown in FIG. 11, RNTI is used as a frozen bit. As described above, in the decoding process, when u _i is decoded, 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.

For example, 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)
In the 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. In the example shown in FIG. 12, 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. On the receiving side, 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.

<Encoding of Method 3>
The encoding process in Method 3 will be described with reference to FIGS. 13A, 13B, and 14. 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 encoding operation will be described in more detail with reference to FIG. 13B. 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.

Then, the base station 20 adds a padding bit to “frozen bit + target information + CRC”. The bit length of “frozen bit + target information + CRC + padding bit” is the bit length (N = 2 ⁿ ) of the input to the Polar encoder.

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.

For example, when 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. When 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 (bit positions and their values) 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.

Further, as described above, when the base station 20 uses a padding bit longer than the RNTI or uses a padding bit shorter than the RNTI, this is known in the user apparatus 10. Further, 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.

FIG. 14 shows an encoding process when N = 8 (2 ³ ). If K is the bit length of the information bit and M is the bit length of “frozen bit + information bit”, the bit length of the frozen bit is M−K and the bit length of the padding bit is NM. FIG. 14 shows a case where K = 4 and M = 6, where the frozen bits are 2 bits (u ₀ , u ₁ ) and the padding bits are 2 bits (u ₆ , u ₇ ).

As shown in FIG. 14, 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 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.

For example, even when the length of the input information (target information + CRC + frozen bit) is N = M = ²ⁿ , it is possible to apply the method 3 by forcibly shortening the input information.

<Decoding method 3>
Next, the decoding process in the method 3 will be described with reference to FIGS. 15A, 15B and 16. FIG. 15A shows an overview of the processing flow in the user apparatus 10. As illustrated in FIG. 15A, for example, 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). In the decoding process, 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. Here, on the encoding side, it is assumed that 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.

FIG. 16 shows a decoding process corresponding to the encoding process (N = 8, K = 4, M = 6) in FIG. As shown in FIG. 16, the likelihood of each bit is input as an input to the decoder (right side in FIG. 16). In the punctured bit, 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. Use as

Also, 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.

For example, 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. When the CRC check is successful, it can be determined that the used 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.

In the above example, 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.

Also, in Method 3, 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.

(Combination of Method 1 to Method 3)
The base station 20 may combine the method 1 and / or the method 2 in the encoding process of the method 3, for example. For example, the base station 20 masks the RNTI on the CRC and / or frozen bit shown in FIG. 13B. When the RNTI is masked on the frozen bit, the user apparatus 10 performs a decoding process using the RNTI as the frozen bit. Further, when the RNTI is masked in the CRC, the user apparatus 10 performs CRC check after unmasking the CRC portion obtained by the decoding process using the RNTI.

It can be considered that by performing the combination as described above, the false detection rate is improved as compared with the case where the combination is not performed.

(Summary of method 1 to method 3, effect, etc.)
FIG. 17 shows the features of Method 1 to Method 3. In Method 1, RNTI is applied to CRC, and unmasking is performed using RNTI after decoding. In Method 2, the RNTI is applied to the frozen bit and the RNTI is used before decoding. In method 3, RNTI is applied to padding bits, and RNTI is used before decoding.

In addition, since FAR (False Alarm Rate, false detection rate) depends on the CRC length in Method 1, more CRC bits are required to obtain a better FAR, and overhead increases. . With method 2, the false detection rate can be reduced without increasing overhead, but the characteristics may be unstable or not robust. For method 3, 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. In FIG. 18, “Frozen RNTI” indicates method 2, and “Shortened RNTI” indicates method 3. The horizontal axis in FIG. 18 is Es / N0 (signal to noise ratio), and the vertical axis is FAR. As shown in FIG. 18, it can be seen that FAR is better in method 3 than in method 2. For example, when two RNTIs differ by 1 bit (eg, RNTI = 0000, RNTI = 0001), the method 3 can identify them better than the method 2.

In addition, since 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.

(Device configuration)
Next, functional configuration examples of the user apparatus 10 and the base station 20 that execute the processing operations described so far will be described.

<User device>
FIG. 19 is a diagram illustrating an example of a functional configuration of the user device 10. As illustrated in FIG. 19, 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.

As illustrated in FIG. 19, 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. For example, 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).

Note that 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.

For example, as described with reference to FIG. 16, 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. .

<Base station 20>
FIG. 20 is a diagram illustrating an example of a functional configuration of the base station 20. As illustrated in FIG. 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.

As shown in FIG. 20, 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. For example, 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).

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.

For example, as described with reference to FIG. 16, the decoding unit 212 decodes encoded information using the likelihood of the received signal and the likelihood corresponding to a predetermined identifier (eg, RNTI). . In addition, 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. .

Note that the signal receiving unit 202 of the base station 20 may not have a function of performing Polar decoding.

<Hardware configuration>
The block diagrams (FIGS. 19 to 20) used in the description of the above embodiment show functional unit blocks. These functional blocks (components) are realized by any combination of hardware and / or software. Further, the means for realizing each functional block is not particularly limited. That is, 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).

Also, for example, 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.

In the following description, 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.

Further, 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. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiments is used. For example, 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. 20 are stored in the memory 1002, and are controlled by the processor 1001. It may be realized by. Although the above-described various processes have been described as being executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. 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. For example, the signal transmission unit 101 and the signal reception unit 102 of the user device 10 may be realized by the communication device 1004. Further, 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).

Also, 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.

In addition, 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. For example, the processor 1001 may be implemented by at least one of these hardware.

(Summary of embodiment)
As described above, according to the present embodiment, 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.

With the above configuration, in a wireless communication system in which encoded information to which a predetermined identifier is applied is transmitted from the transmission side and information is detected using the predetermined identifier on the reception side, a good false detection rate on the reception side Technology is provided that makes it possible to obtain

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.

In addition, according to the present embodiment, 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. A receiving unit that obtains a likelihood for each bit of the signal, and a decoding unit that decodes the encoded information using the likelihood and a likelihood corresponding to a predetermined identifier. An apparatus is provided.

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.

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.

(Supplement of embodiment)
Although the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various variations, modifications, alternatives, substitutions, and the like. I will. Although specific numerical examples have been described in order to facilitate understanding of the invention, these numerical values are merely examples and any appropriate values may be used unless otherwise specified. The classification of items in the above description is not essential to the present invention, and the items described in two or more items may be used in combination as necessary, or the items described in one item may be used in different items. It may be applied to the matters described in (if not inconsistent). The boundaries between functional units or processing units in the functional block diagram do not necessarily correspond to physical component boundaries. 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. About the processing procedure described in the embodiment, the processing order may be changed as long as there is no contradiction. For convenience of description of the processing, 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.

Further, the notification of information is not limited to the aspect / embodiment described in the present specification, and may be performed by other methods. For example, 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. Further, 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 (Fureure Radio Access), and W-CDMA. (Registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra 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 processing procedures, sequences, flowcharts and the like of each aspect / embodiment described in this specification may be switched in order as long as there is no contradiction. For example, the methods described herein present the elements of the various steps in an exemplary order and are not limited to the specific order presented.

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. In a network composed of one or a plurality of network nodes having a base station 20, 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. Obviously, it can be done by a network node (for example, but not limited to MME or S-GW). Although the case where there is one network node other than the base station 20 in the above is illustrated, a combination of a plurality of other network nodes (for example, MME and S-GW) may be used.

Each aspect / embodiment described in this specification may be used alone, in combination, or may be switched according to execution.

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.

As used herein, the terms “determining” and “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. Further, “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”. In addition, “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”.

As used herein, 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.”

As long as the terms “including”, “including”, and variations thereof are used herein or in the claims, these terms are similar to the term “comprising”. It is intended to be comprehensive. Furthermore, the term “or” as used herein or in the claims is not intended to be an exclusive OR.

Throughout this disclosure, if articles are added by translation, for example, a, an, and the in English, these articles are not clearly indicated otherwise from the context, Multiple can be included.

Although the present invention has been described in detail above, it will be apparent to those skilled in the art that the present invention is not limited to the embodiments described herein. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

10, 15 User device 101 Signal transmission unit 102 Signal reception unit 103 Setting information management unit 20 Base station 201 Signal transmission unit 202 Signal reception unit 203 Setting information management unit 204 Scheduling unit 1001 Processor 1002 Memory 1003 Storage 1004 Communication device 1005 Input device 1006 Output device

Claims

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 communication device.
The communication apparatus according to claim 1, wherein the transmission unit punctures the predetermined identifier obtained by the encoding from the encoded information.
A communication device used in a wireless communication system,
A receiver that acquires the likelihood of each bit of encoded information encoded by predetermined encoding by demodulating a signal received from another communication device;
A communication apparatus comprising: a decoding unit that decodes the encoded information using the likelihood and a likelihood corresponding to a predetermined identifier.
The communication device according to claim 3, wherein the decoding unit uses a frozen bit value and a known padding bit value as known bit values used in the decoding.
The decoding unit performs a check with an error detection code on information obtained by decoding the encoded information, and determines the information as a final decoding result when the check is successful. Item 5. The communication device according to Item 3 or 4.
A decoding method executed by a communication device used in a wireless communication system,
A reception step of acquiring a likelihood for each bit of encoded information encoded by a predetermined encoding by demodulating a signal received from another communication device;
A decoding method comprising: a decoding step of decoding the encoded information using the likelihood and a likelihood corresponding to a predetermined identifier.