JP2022069477A - Radio communication equipment and radio communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve error correction rate of HARQ.

SOLUTION: Radio communication equipment includes a frame division part, a block coding part, an encoded frame generation part, a coded frame aggregation part, and a transmission part. The frame division part divides the data of a frame to be transmitted into an information bit string of a first prescribed number, and if there is an information bit string less than the first prescribed number bits, adds a padding bit to the information bit string as the block of bit string of the first prescribed number. The block coding part generates an error correction bit string, i.e., a bit string of a second prescribed number bits, for each of the divided blocks, and generates a coded block added with the error correction bit string. A coded frame generation part generates a coded frame by combining the coded blocks. The coded frame aggregation part generates transmission packet data by aggregating the generated coded frames. The transmission part transmits the transmission packet data.

SELECTED DRAWING: Figure 3

COPYRIGHT: (C)2022,JPO&INPIT

Description

Embodiments of the present invention relate to wireless communication devices and wireless communication methods.

Hybrid automatic repeat control (HARQ: Hybrid Automatic Repeat Request) is known as a technique for improving the bandwidth utilization efficiency of wireless communication. This HARQ is one of the error control techniques used in wireless communication, and uses a combination of automatic repeat control (ARQ) and forward error correction (FEC). In order to realize HARQ, a method using block-coded data has also been developed.

In HARQ, it is also possible to aggregate and transmit a plurality of encoded frames of data. However, when the encoded data is frame-aggregated (frame aggregation), there may be a case where the coded boundary and the frame boundary do not match.
In such a case, the boundaries of the information bits in each codeword do not always match between the initial transmission frame and the retransmission frame, and the bit sequence differs between the initial transmission frame and the retransmission frame in which the parity of the codeword is different. May become. As a result, it becomes difficult to synthesize the parity unit, and the error correction function in HARQ cannot be fully exerted.

International Publication No. 2009/06628

An embodiment of the present invention provides a wireless communication device that improves the error correction rate of HARQ even when the frames are aggregated.

The wireless communication device as an embodiment of the present invention includes a frame dividing unit, a block coding unit, a coded frame generation unit, a coded frame aggregation unit, and a transmission unit. The frame division unit is a frame division unit that divides the data of the frame to be transmitted into an information bit string of the first predetermined number of bits to generate a block, and when there is an information bit string less than the first predetermined number of bits. A padding bit is added to the information bit string to form a block of the first predetermined number of bit strings. The block coding unit generates an error correction bit string, which is a bit string of a second predetermined number of bits, for each of the divided blocks, and generates a coded block to which the error correction bit string is added. The coded frame generation unit combines the coded blocks to generate a coded frame which is a coded frame. The coded frame aggregation unit aggregates the generated coded frames to generate transmission packet data. The transmission unit transmits the transmission packet data.

The figure which shows an example of a packet data. The figure which shows an example of a packet data. The block diagram which shows the function of the wireless communication apparatus which concerns on one Embodiment. The figure which shows an example of data coding. The figure which shows an example of wireless communication. The figure which shows the frame aggregated bit string which concerns on one Embodiment. A flowchart showing a frame aggregation process according to an embodiment. The figure which shows the example of the bit string of the frame aggregation which concerns on one Embodiment. The figure which shows the example of the likelihood synthesis which concerns on one Embodiment. The figure which shows another example of the likelihood synthesis which concerns on one Embodiment. The figure which shows the frame aggregated bit string which concerns on one Embodiment. The figure which shows the processing of the coded frame at the end of a frame which concerns on one Embodiment. The figure which shows the example of the bit string of the frame aggregation which concerns on one Embodiment. The functional block diagram of the access point or the terminal which concerns on one Embodiment. The figure which shows the example of the whole structure of the terminal or access point which concerns on one Embodiment. The figure which shows the hardware configuration example of the wireless communication apparatus mounted on the terminal or access point which concerns on one Embodiment. The functional block diagram of the terminal or access point which concerns on one Embodiment. A perspective view of a terminal according to an embodiment. The figure which shows the memory card which concerns on one Embodiment. The figure which shows an example of the frame exchange of the contention period which concerns on one Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. All embodiments described below relate to wireless communication devices that streamline HARQ.

HARQ is used as one of the methods for improving the bandwidth utilization efficiency in wireless packet communication. This HARQ is used in wireless communication such as HSDPA (High Speed Downlink Packet Access) and LTE (Long Term Evolution), for example. In HARQ, when an error occurs on the receiver side, a retransmission packet is transmitted from the transmitter side, and reliability information is synthesized on the receiver side to improve signal quality. As a reliability technique, there is a method of synthesizing a log-likelihood ratio (LLR) to improve signal quality. In HARQ, two methods are mainly used.

The first method is the CC (Chase Combining) method. In the CC method, the transmitter transmits the same data as the initial transmission packet (hereinafter referred to as the first transmission packet) and the retransmission packet, and the receiver performs likelihood synthesis. This likelihood synthesis can reduce the effects of noise and improve the quality of the received signal.

The second method is the IR (Incremental Redundancy) method. In the IR method, the transmitter transmits data in which some or all of the initial packet and the retransmission packet are different. A redundantly encoded signal is transmitted in the initial transmission packet, and an additional redundant signal is transmitted in a retransmission packet from the transmitter when error correction is not possible in the receiver. By synthesizing the likelihood of the first packet and the likelihood of the retransmission packet in the receiver, it is possible to improve the error correction capability and the reception performance. This embodiment can be applied to either of the above two CC methods and IR methods.

FIG. 1 is a diagram showing a packet configuration generally used as a wireless communication packet. The packet is headed with a PHY header 500 followed by PHY data 550.
The PHY data 550 includes a MAC header 700 and a payload 750. The PHY data 550 may further include an error detection bit (sequence) 760 called an FCS (Frame Check Sequence).

The PHY header 500 stores information necessary for signal processing of the physical layer. The MAC header 700 stores information necessary for signal processing of the MAC layer (Media Access Control Layer). The receiver reads the information stored in these headers, and then decodes the payload 750.

The combination of the MAC header 700 and the payload 750 is called the MAC frame 600. FIG. 1 shows packet data including one MAC frame 600.

FIG. 2 is a diagram showing packet data including a plurality of MAC frames. As shown in FIG. 2, the packet data may include a plurality of MAC frames. For example, the PHY data 550 may include a first MAC frame 601, a second MAC frame 602, and a third MAC frame 603. The PHY data 550 is not limited to this, and may include more MAC frames. By providing a plurality of MAC frames in this way, a large amount of information can be transmitted in the transmission per packet data.
Hereinafter, the MAC frame may be simply referred to as a frame.

In wireless packet communication, one packet may be configured to include a plurality of frames as shown in FIG. Bundling multiple frames is called frame aggregation (frame aggregation). The wireless communication device on the receiving side executes the decoding process for each frame and determines whether or not the reception is successful. By aggregating frames in this way, high speed and large capacity of wireless communication can be achieved.

(First Embodiment)
FIG. 3 is a block diagram showing a function of the wireless communication device 1 according to the present embodiment. The wireless communication device 1 includes a transmission block 10, a reception block 20, a control unit 30, and a wireless unit 40.

The transmission block 10 includes a frame division unit 100, a block coding unit 101, a coded frame generation unit 102, a frame aggregation unit 103, a PHY header generation unit 104, a transmission unit 105, and a transmitted data storage unit 106. And, the message to be transmitted is encoded, and the generated transmission packet data is transmitted.

The processing in each block may be performed by software (program) operating in a processor such as a CPU, may be performed by hardware, or may be performed by both software and hardware. Further, the processing in each block may be performed by analog processing, digital processing, or both analog processing and digital processing.

The frame dividing unit 100 divides a frame of a message to be transmitted into an information bit string having a first predetermined number of bits to generate a block. For example, blocks are generated for each first predetermined number in the order in which the information bit strings of the message are arranged. The last block may be less than the first predetermined number of information bits. In this case, a padding bit is added to the information bit string to make a block having the first predetermined number of bits. The padding bit may be, for example, an array of 1-bit constants such as 0 or 1, an array of 2-bit constants such as 10, or any other padding bit as long as it can be clearly distinguished. It may be padded by the method of.

The block coding unit 101 encodes each block divided by the frame dividing unit 100. The block coding unit 101 generates an error correction code having a second predetermined number of bits for the information bit string of the first predetermined number of bits of each block. Then, an error correction code generated from the information bit string is added to the information bit string to generate a coded block having a first predetermined number + a second predetermined number of bits (hereinafter referred to as a coded block). Encode the block with.

Any coding method may be used as long as it can be appropriately decoded.
For example, coding such as a Hamming code, a BCH code, a turbo code, a low density parity check code (LDPC), and a concatenated code in which these are concatenated can be used. The data may also be scrambled before or after encoding.

FIG. 4 is a diagram showing an example in which an information bit string is encoded. First, the block coding unit 101 changes from the information bit string which is the first predetermined number of bits (when the information bit string is less than the first predetermined number of bits, the bit string including padding) to the coding method as described above. A parity bit (error correction bit string) which is a second predetermined number of bits which is an acquired redundant bit is generated. By bundling these information bit strings and parity bits, one codeword is generated. Here, the coding rate R is defined as the number of bits of the information bit string / the number of bits of the codeword, that is, the coding rate R = (first predetermined number) / (first predetermined number + second predetermined number).

In the above, padding is added when dividing into blocks, but the present invention is not limited to this. That is, the frame dividing unit 100 only divides the frame for each first predetermined number of bits, and the block coding unit 101 performs padding on the information bit string less than the first predetermined number of bits before encoding. You may try to do it.

The coded frame generation unit 102 generates a coded frame (hereinafter referred to as a coded frame) by connecting the coded blocks. Since the coded frame is a concatenation of coded blocks having the number of bits of the first predetermined number + the second predetermined number, the number of bits is an integral multiple of the first predetermined number + the second predetermined number.

The frame aggregation unit 103 aggregates the coded frames generated by the frame division unit 100, the block coding unit 101, and the coded frame generation unit 102 for a plurality of frames included in the transmitted message, and collects one PHY data. To generate.

The PHY header generation unit 104 generates a PHY header for the generated PHY data. This PHY header is the same as the PHY header used in general HARQ, and it is not necessary to incorporate a special bit string particularly limited to the present embodiment. Further, the PHY header generation unit 104 adds the generated PHY header to the PHY data to generate encoded and frame-aggregated transmission packet data which is a bit string to be transmitted.

The transmission unit 105 transmits the generated transmission packet data to the outside via the radio unit 40. Further, in the case of the wireless communication device 1 on the receiving side, an ACK (Acknowledgment) signal or an NACK (Negative-Acknowledgement) signal indicating whether or not the packet data transmitted from the outside can be received is transmitted.

The transmitted data storage unit 106 stores all or part of the information transmitted by the transmission unit 105. The information to be stored may be the information of the message before encoding or the information of the transmitted packet data after being encoded. This stored information is used when generating transmission packet data to be retransmitted when a retransmission request comes from the wireless communication device 1 on the receiving side.

The reception block 20 includes a reception unit 200, a PHY header analysis unit 201, a likelihood synthesis unit 202, a decoding unit 203, and a received data storage unit 204, and receives transmission packet data transmitted from the outside. And decrypt it into a message.

The receiving unit 200 receives packet data transmitted from the outside via the wireless unit 40.

The PHY header analysis unit 201 analyzes the PHY header of the packet data received by the reception unit 200, and acquires information necessary for reception, information necessary for decoding a message, and other information related to packet data.

When the received packet data is the retransmitted packet data, the likelihood synthesis unit 202 performs the likelihood synthesis and determines whether or not the packet reception is successful. In the HARQ method, the reliability of communication is improved in this way.

The decoding unit 203 decodes the coded data in the wireless communication device 1 on the transmitting side. The decoding unit 203 decodes the received packet data using the same method as the coding. This decoding may be performed for each coded block. That is, the decoding unit 203 divides the PHY data portion of the received packet data into blocks for each of the first predetermined number + the second predetermined number of bits, and decodes each divided block. Then, by concatenating the decoded blocks, the message to be transmitted by the wireless communication device 1 on the transmitting side is acquired.

Further, when the information bit string or the coded block is scrambled, the decoding unit 203 may perform descramble processing. The timing of descramble corresponds to the timing scrambled in encoding. If the block is scrambled before encoding, the coded block is decoded and then descrambled, and if it is scrambled after the block is encoded, the coded block is descrambled and then decoded.

The received data storage unit 204 stores the packet data received by the reception unit 200. The stored packet data is used when performing likelihood synthesis of the packet data retransmitted from the wireless communication device 1 on the transmitting side when reception fails and a retransmission request is made.

The control unit 30 controls the above-mentioned processing of the wireless communication device 1 and performs other necessary processing. The other necessary processing is, for example, a processing of outputting received packet data to a necessary computer or the like. Further, for example, TCP / IP or UDP / IP processing may be performed in the upper layer. The processing of the upper layer may be performed by software (program) by a processor such as a CPU (Central Processing Unit), or may be performed by hardware. As described above, the control unit 30 may be provided with a CPU or the like, or may be designed with a simpler circuit.

Further, the control unit 30 mainly performs all or part of the processing of the MAC layer and the processing of the physical layer. The control unit 30 may include a UL-MU processing unit that performs processing related to UL-MU, and a CRC inspection unit that performs CRC inspection of frames or packets.

The radio unit 40 converts the packet data from the transmission unit 105 into radio waves and transmits the radio waves, and also converts the packet data received from the outside as radio waves into a signal and outputs the signal data to the reception unit 200. The radio unit 40 may include an antenna 410 for transmitting and receiving radio waves.
The antenna 410 may be a chip antenna, an antenna formed by wiring on a printed circuit board, or an antenna formed by using a linear conductor element.

FIG. 5 is a diagram showing an outline of wireless communication using HARQ between the wireless communication device 1A on the transmitting side and the wireless communication device 1B on the receiving side. The straight lines at the bottom of the wireless communication devices 1A and 1B indicate the flow of time, indicating that time has elapsed from the top to the bottom of the drawing. Hereinafter, unless otherwise specified, the transmitting side wireless communication device 1 and its elements are designated by reference numeral A, and the receiving side wireless communication device 1 and its elements are designated by reference numeral B.

First, the wireless communication device 1A transmits packet data, which is the first packet, from the transmission unit 105A to the wireless communication device 1B. Note that the transmission of this packet is not limited to transmission from the wireless communication device 1A to the wireless communication device 1B with directivity, and the wireless communication device 1A may transmit packet data by broadcasting or the like.

The wireless communication device 1B receives the first-delivered packet in the receiving unit 200B, and performs decoding processing of the first-delivered packet. The determination of whether or not the packet is the first packet is read from, for example, the data recorded in the PHY header 500 or the like.

If there is no decoding error in the decoding process, the wireless communication device 1B transmits the ACK packet to the wireless communication device 1A via the transmission unit 105B. If there is a decryption error, the ACK packet is not returned or the NACK packet (not shown) is transmitted. The transmission of the ACK / NACK packet in the wireless communication device 1B may be directional or may be broadcast or the like, similarly to the transmission of the packet in the wireless communication device 1A. As described above, when the ACK / NACK packet is transmitted, the wireless communication device 1B transmits the ACK / NACK packet within the SIFS (Short Inter Frame Space) time. This SIFS time is defined as a different time interval by the standard, for example, in IEEE802.11ac, it is defined as 16 usc.

Further, when a decoding error occurs, the wireless communication device 1B stores the likelihood of the payload 750 in the received data storage unit 204 together with the above measures. As another example, the data of the payload 750 may be stored in the received data storage unit 204.

The wireless communication device 1A determines whether the reception of the first transmission packet was successful or unsuccessful in the wireless communication device 1B based on the reception state of the ACK / NACK packet from the wireless communication device 1B received by the receiving unit 200A. When it is determined that the reception of the first packet is successful in the wireless communication device 1B, the wireless communication device 1A ends the processing related to the first transmission packet already transmitted, and proceeds to the processing such as transmission / reception of the next packet.

On the other hand, when it is determined that the reception of the first packet has failed in the wireless communication device 1B, the wireless communication device 1A transmits the retransmission packet. This retransmission packet is transmitted by the transmission unit 105A of the wireless communication device 1A with data indicating that it is a retransmission packet, a redundant packet for the retransmission packet, and the like. The wireless communication device 1A may include a separate generation unit that generates packet data for the initial packet and the retransmission packet.

After receiving the retransmission packet, the wireless communication device 1B decodes the PHY header 500 and the MAC header 700 included in the retransmission packet, and determines whether the received packet is the first transmission packet or the retransmission packet.

If it is determined that the packet is a retransmission, the wireless communication device 1B performs the likelihood synthesis in the likelihood synthesis unit 202B, and then executes the decoding process in the decoding unit 203B. The likelihood synthesis is performed based on the information of the frame that has been received in the past and requested to be retransmitted, which is stored in the received data storage unit 204, and the retransmission frame. When it is determined that the quality of the received signal is improved by the likelihood synthesis in the likelihood synthesis unit 202B and the decoding error in the retransmission packet has disappeared, the transmission unit 105B waits for the SIFS time to elapse after the reception of the retransmission packet is completed. Send an ACK packet.

When the wireless communication device 1A receives the ACK signal within a predetermined time, the wireless communication device 1B determines that the reception is successful, and ends the transmission process of the data contained in the packet. On the other hand, if the ACK signal is not received or the NACK signal is received, it is determined that the reception has failed in the wireless communication device 1B, and the data retransmission process included in the packet is retransmitted.

In this way, the wireless communication between the wireless communication device 1A and the wireless communication device 1B is repeated until the packet data is normally transmitted and received. In addition, it is not limited to being repeated until it is normally transmitted / received, and if transmission / reception is not successful after repeating a predetermined number of times, transmission / reception processing of the packet data is performed in order to secure a band for other communication. It may be stopped or stopped.

The parts where the processing of the frame division unit 100, the block coding unit 101, the frame aggregation unit 103, the PHY header generation unit 104, the PHY header analysis unit 201, the likelihood synthesis unit 202, the decoding unit 203, etc., as described above, are performed. A part or all of them may be composed of a circuit, or the wireless communication device 1 may include a processing circuit for collectively processing the functions of each of these parts.

When packet data having a plurality of MAC frames as shown in FIG. 2 is encoded by the number of bits as shown in FIG. 4 and transmitted, the entire PHY data is regarded as one data, blocked and encoded, and transmitted. do. Since the number of bits of each MAC frame and the number of bits of the information bit of coding are independent of each other, the boundary of each MAC frame and the boundary of the codeword generally do not match. In the present embodiment, when each MAC frame in the PHY data to be transmitted is blocked, the boundary of the MAC frame and the boundary of the codeword are matched by appropriately adding a padding bit, and the accuracy of the likelihood synthesis is improved. It is something that tries to improve.

FIG. 6 is a diagram showing an example of PHY data 550 in packet data, that is, data including a plurality of MAC frames. In FIG. 6, as an example, the PHY data 550 including two MAC frames is illustrated. In the figure below, D is a bit string of an information bit, P is a bit string of a parity bit, and Z is a bit string of a padding bit.

In the example of FIG. 6, the PHY data 550 comprises an encoded MAC frame 601 and a MAC frame 602. The MAC frame 601 includes codewords 801, 802, 803, and 804, and the MAC frame 602 includes codewords 805 and 806. Each codeword comprises an information bit string and a parity bit string. For example, the codeword 801 includes an information bit string 810 and a parity bit string 812. Further, a padding bit string is provided as needed. For example, the codeword 804 includes an information bit string 840, a padding bit string 841, and a parity bit string 842.

The information bit string is a block of the bit string of the MAC frame before encoding for each first predetermined number of bits. That is, the information bit strings 810, 820, 830, and 850 are bit strings of the first predetermined number of bits. When the number of bits of the bit string of the MAC frame before encoding does not match an integral multiple of the first predetermined number, dividing into blocks for each first predetermined number generates too many information bit strings. For example, the information bit strings 840 and 860 are bit strings having a number of bits less than the first predetermined number.

In such a case, the padding bit strings 841 and 861 are added to the information bit strings 840 and 860. The padding bit string 841 is a bit string having a number of bits obtained by subtracting the number of bits of the information bit string 840 from the first predetermined number, and the padding bit string 861 is a value obtained by subtracting the number of bits of the information bit string 860 from the first predetermined number. A bit string having a number of bits.
This padding bit is, for example, a bit string having all 0 values or a bit string having all 1 values. The present invention is not limited to these, and may be a predetermined random bit string. As described above, the information bit string having a bit number less than the first predetermined number of bits is converted into a block which is a bit string of the first predetermined number of bits by adding the padding bit string.
In FIG. 6, the padding bit string 841 is located between the information bit string 840 and the parity bit string 842, but is not limited to this. The padding bit string 841 may be placed before the information bit string 840, or may be placed after the parity bit string 842.

After dividing the MAC frame, each divided block is coded to generate a codeword. For example, by performing a predetermined operation on the information bit string 810, a parity bit string 812 having a second predetermined number of bits is generated. Then, by combining the information bit string 810 and the parity bit string 812, a coded block having a first predetermined number + a second predetermined number of bits is generated. As described above, the method of generating the parity bit string is performed by using an arbitrary method. For the information bit string 840, a parity bit string 842 having a second predetermined number of bits is generated and a coded block is generated by performing a predetermined operation after the padding bit string 841 is added so as to be the first predetermined number of bits. ..

In this way, when the data to be transmitted is divided into blocks, the boundary of the encoded MAC frame and the boundary of the codeword, that is, the coded block are matched by adding a padding bit string as necessary. Is possible. In the example of FIG. 6, the end of the codeword 804 coincides with the end of the encoded MAC frame 601 and similarly, the end of the codeword 806 coincides with the end of the encoded MAC frame 602. ing. Such block division and encoding are applied to both the initial packet and the retransmission packet. That is, in the packet to be transmitted in the present embodiment, both the initial packet and the retransmission packet are in a mode in which the boundary of the MAC frame and the boundary of the codeword coincide with each other.

FIG. 7 is a flowchart showing the coding process of the transmission data, particularly the PHY data 550 portion, according to the present embodiment. Further, FIG. 8 is a diagram showing division and combination of data in each process. By referring to these figures, the processing up to the frame aggregation of the present embodiment will be described.

First, the frame division unit 100 of the wireless communication device 1 divides the bit string of the frame of the data to be transmitted into each first predetermined number of bits (S100).

Next, when there is a block having a bit number less than the first predetermined number of bits, the frame dividing unit 100 adds a padding bit to the block to form a bit string of the first predetermined number of bits (S102). The block less than the first predetermined number of bits is, for example, the last block when dividing from the beginning of the frame into blocks.

Next, the block coding unit 101 calculates a parity bit, which is a redundant bit for error correction, for each block, which is a bit string of the first predetermined number of divided bits (S104).

Next, the block coding unit 101 generates a coded block by combining the bit string of the block and the calculated parity bit (S106). The processes from S100 to S106 may be repeated for each block from S100 to S106, or each process from S100 to S106 may be performed in parallel in some or all blocks. good.

Next, the coded frame generation unit 102 combines the generated coded blocks for each frame to generate a coded frame (S108).

Next, the frame aggregation unit 103 aggregates the generated coded frames to generate PHY data 550 (S110).

By performing such processing, in the bit string of each frame stored in the PHY data 550, the end of the frame is generated so as to coincide with the end of the codeword (encoding block).

FIG. 9 is a diagram showing an example of likelihood synthesis according to the present embodiment. FIG. 9 shows an example in which reception of MAC frames 601 and 603 was successful and reception of MAC frame 602 failed. In this way, when the MAC frame 602 fails to receive, for example, the MAC frames 604, 602, and 605 are frame-aggregated as retransmission packets in this order.

Even if the total size of the MAC frames existing before the MAC frame 602 is different, the start address of the MAC frame 602 and the codeword at the beginning of the MAC frame 602 are both in the initial transmission frame and the retransmission frame. The starting address of is matched. Therefore, it is possible to perform likelihood synthesis with the parity bit string included without decoding the information bit string of the frame.

When the padding bit is not inserted, in the example of FIG. 9, in the first packet, the information bit string of the last block of MAC frame 601 and the information bit string of the first block of MAC frame 602 are included in the same code word. On the other hand, in the retransmission packet, the information bit string of the last block of the MAC frame 604 and the information bit string of the first block of the MAC frame 602 are included in the same code word, so that the bit strings are different. Furthermore, since the boundary of the bit string of the MAC frame 602 is also different between the initial packet and the retransmission packet, it is difficult to perform likelihood synthesis before decoding the MAC frame 602, and the parity bit string is different in the first place. Since it is a bit string, it becomes impossible to perform likelihood synthesis. The same can be said at the end of the MAC frame 602.

As described above, according to the present embodiment, by appropriately adding a padding bit to the MAC frame, the boundary of the MAC frame in the PHY data 550 and the boundary of the codeword after each MAC frame is encoded are used. Can be matched. That is, it is possible to match the boundary of the MAC frame transmitted in the first packet with the boundary of the same MAC frame transmitted in the retransmission packet.

Therefore, in each packet data, the received data before decoding, which has been difficult to perform the likelihood synthesis by direct comparison in the past, is subjected to the likelihood synthesis without decoding according to the present embodiment. Is possible, and the likelihood synthesis can be performed efficiently. Further, since the likelihood synthesis can be performed for the parity bit, the effect of improving the signal reception sensitivity can be further enhanced. In particular, in the CC method HARQ, the likelihood synthesis is performed based on the premise that the frame of the first packet that failed to be received and the frame of the retransmission packet send the same data, so that the effect of this embodiment is high.

(Second Embodiment)
In the above-described embodiment, the transmission packet data is mainly generated in the CC method HARQ, but it is effective to improve the signal reception sensitivity by inserting the padding not only in the CC method but also in the IR method. Hereinafter, the case of the IR method will be described.

In the case of the IR method, in the retransmission frame, a part or all of the parity bits in the redundantly encoded bit string are retransmitted. In this case, for example, the coding in the retransmission frame is performed by the same method as the first feed frame, and the coding rate is lower than that of the first feed frame, that is, the coding with a larger number of error correction bits. Is used.

The coding according to the present embodiment will be described with reference to the flowchart of FIG. 7. The same processing as in the first embodiment is performed for the coding of the first packet or the first frame. Regarding the retransmission frame, the processes from S100 to S104 are the same as those in the first embodiment described above. However, in the calculation of the parity bit string in S104, the parity bit string is calculated so as to be the third predetermined number of bits, which is a value larger than the second predetermined number, instead of generating the bit string of the second predetermined number of bits. In this way, the coding rate is set lower than that of the first frame.

In the present embodiment, the block coding unit 110 at the time of generating the retransmission frame uses the parity bit string calculated in S104 as it is as the coding block (S106). Depending on the coding method, the parity bit string calculated from the same information bit string may include a common bit string. In such a case, the common bit string is omitted, and only the portion of the calculated new parity bit string extended from the original parity bit string, that is, a part of the error correction bit string is encoded. You may want to generate a block.

The subsequent processing is also the same as in the first embodiment. That is, in the retransmission frame, a part or all of the parity bit string calculated in S104 is used as a coding block, and a coding frame is generated from this coding block (S108), and a frame with another initial transmission frame or retransmission frame. Aggregate (S110) to generate packet data.

FIG. 10 is a diagram showing an example of an initial packet and a retransmission packet according to the present embodiment. The situation shall be similar to that of FIG. In the retransmission packet, the MAC frame 602'in which the parity bit calculated by the coding rate lower than that of the first MAC frame 602 is used as the coding block is transmitted to the MAC frame 602 as the retransmission frame.

As can be seen from this figure, the length of the codeword itself is the number of bits of the first predetermined number + the second predetermined number in the first transmission frame, and is the third predetermined number in the retransmission frame, so that they do not necessarily match. It's not a thing. However, the boundary of the codeword coincides with the boundary of the frame by the padding bit strings of MAC frames 601 and 604 and the like.

As described above, according to the present embodiment, even in the IR method HARQ, it is possible to match the boundary of the codeword with the boundary of the frame by inserting the padding, and the information bit string is decoded. It is possible to perform likelihood synthesis without any need. Further, by setting the code rate of the frame to be retransmitted lower than that of the bit string initially sent, it is possible to increase the number of bits of the error correction bit string, and as a result, more reliable wireless communication while suppressing the bandwidth. It can be performed.

(Third Embodiment)
In each of the above-described embodiments, a padding bit is inserted to prevent data in different frames from being included in the same block when generating codewords by making blocks the same size, and a frame to be transmitted. Although it has been described that the boundary of the codeword and the boundary of the codeword are matched, the present embodiment is intended to further improve the communication efficiency.

FIG. 11 is a diagram schematically showing PHY data 550 of the transmission packet according to the present embodiment. FIG. 11 transmits data equivalent to the data in FIG. Comparing FIG. 6 and FIG. 11, the codewords 801 and 802, 803 and 805 are the same, but there are differences between the codewords 804 and 806 of FIG. 6 and the codewords 804'and 806' of FIG. be.

The codewords 804 and 806 store the padding bits as they are as a transmission frame, but the codewords 804'and 806' are configured to include an information bit string and a parity bit string in which the padding bits are not included and the padding bit strings are omitted. To. On the other hand, the boundaries of the codewords 804'and 806' coincide with the boundaries of the encoded MAC frames 601 and 602. Since the boundaries of the codeword and the frame are the same, the likelihood synthesis is performed in the wireless communication device 1 on the receiving side without decoding, that is, in a state including the parity bit string, as in the above-described embodiment. It becomes possible.

However, if the padding bit string is omitted in this way, the length of the codeword at the end of each frame is not a predetermined length (first predetermined number + second predetermined number), so this information can be used, for example, PHY. It is necessary to store it in the header 500 or the like. The additional information stored in the PHY header 500 includes, for example, the start address of each frame, the size and sequence number of each frame, the length of the codeword in each frame, and the number of bits of the padding bit omitted in the block at the end of each frame. , Information such as information about the padding bit string, and select and store the necessary information from these information. Such information is generated in the PHY header generation unit 104.

The wireless communication device 1 on the receiving side performs the likelihood synthesis for each frame, for example, by acquiring the information of the start address of each frame before the likelihood synthesis. Further, when decoding data, it is necessary to acquire information about the codeword at the end of each of the above frames before decoding and appropriately restore the padding bit string. By executing decryption after restoring the padding bit string, it is possible to perform error correction normally.

FIG. 12 is a diagram schematically showing the processing of the codeword 804'in the wireless communication device 1 on the receiving side. Likelihood synthesis of frames containing the codeword 804'can also be done without restoring the padding bits. On the other hand, decoding of the codeword 804'is performed after the padding bits are restored and converted to the codeword 804. Of course, the likelihood synthesis may be performed after conversion to the codeword 804. In this way, at least before decoding, the padding bit is restored, the error correction code is returned to the calculated state, and then decoding is performed.

The processing of coded block generation in this embodiment will be described with reference to FIG. 7. The processing for S100 to S104 is the same as that of the first embodiment.

After calculating the parity bit string, the block coding unit 101 generates a coded block (S106). The coded block is generated by combining an information bit string and a parity bit string. That is, for the block at the end of the frame to which the padding bit string is added, the parity bit string is calculated by combining the information bit string and the padding bit string, and the information bit string and the calculated parity bit string are combined to form a coded block. Generate. As described above, the padding bit string is used in the calculation of the parity bit, but is not included in the coding block.

As described above, according to the present embodiment, by inserting a padding bit into the information of the frame and performing coding, the boundary of the frame and the boundary of the codeword are matched, and the parity bit string is obtained before decoding, that is, the parity bit string. It is possible to perform likelihood synthesis in the included state, improve the signal reception sensitivity, and at the same time, by not transmitting the padding bit string, in the communication of packet data including the frame. , The band used can be reduced, and the communication efficiency can be improved.

Also in this embodiment, as in the second embodiment, the retransmission frame may not include the information bit string and may transmit data including the information of the parity bit string. FIG. 13 is a diagram showing an example in the case where the information of the information bit string is not transmitted. As shown in FIG. 13, the MAC frame 602'does not transmit the information of the information bit string. On the other hand, the coding block at the end of the MAC frame 604 does not include the padding bit string.

Even in such a state, since it is possible to match the boundary of the MAC frame with the boundary of the codeword of the codeword at the end of the MAC frame, the likelihood synthesis in the IR method is the same as in the second embodiment. Can be done.

Each embodiment described above is not limited to HARQ, and can be applied to communication in which data is transmitted and the likelihood of the data is synthesized on the receiving side. Of course, this communication is not limited to wireless communication, but can also be used for wired communication. It can also be used for communication between modules via a bus in one device, or it can be used for communication between an embedded device and an embedded device in a system including an embedded device. It is possible.

(Fourth Embodiment)
FIG. 14 is a functional block diagram of the base station (access point) 400 according to the present embodiment. This access point includes a communication processing unit 401, a transmitting unit 402, a receiving unit 403, antennas 42A, 42B, 42C, 42D, a network processing unit 404, a wired I / F 405, and a memory 406. .. The access point 400 is connected to the server 407 via a wired I / F 405. At least the former of the communication processing unit 401 and the network processing unit 404 has the same functions as the functions of encoding, decoding, and the like in the control unit, the transmission unit, and the reception unit described in the first embodiment. The transmitting unit 402 and the receiving unit 403 have the same functions as the transmitting unit and the receiving unit described in the first embodiment. Alternatively, the transmission unit 402 and the reception unit 403 correspond to the processing of the analog area of the transmission unit and the reception unit of the first embodiment, and the processing of the digital area of the transmission unit and the reception unit of the first embodiment is the communication processing unit. It may correspond to 401. The network processing unit 404 has the same function as the higher-level processing unit. Here, the communication processing unit 401 may internally hold a buffer for transferring data to and from the network processing unit 404. This buffer may be a volatile memory such as DRAM or a non-volatile memory such as NAND or MRAM.

The network processing unit 404 controls data exchange with the communication processing unit 401, data writing / reading with the memory 406, and communication with the server 407 via the wired I / F 405. The network processing unit 404 may perform communication processing higher than the MAC layer and processing of the application layer such as TCP / IP and UDP / IP. The operation of the network processing unit may be performed by processing software (program) by a processor such as a CPU, may be performed by hardware, or may be performed by both software and hardware.

As an example, the communication processing unit 401 corresponds to a baseband integrated circuit, and the transmitting unit 402 and the receiving unit 403 correspond to an RF integrated circuit for transmitting and receiving frames. The communication processing unit 401 and the network processing unit 404 may be configured by one integrated circuit (1 chip). The digital region processing portion and the analog region processing portion of the transmission unit 402 and the reception unit 403 may be configured by different chips. Further, the communication processing unit 401 may execute communication processing higher than the MAC layer such as TCP / IP and UDP / IP. Further, although the number of antennas is four here, it is sufficient that at least one antenna is provided.

The memory 406 stores the data received from the server 407 and the data received by the receiving unit 403. The memory 406 may be, for example, a volatile memory such as DRAM or a non-volatile memory such as NAND or MRAM. Further, SSD, HDD, SD card, eMMC and the like may be used. The memory 406 may be outside the base station 400.

The wired I / F 405 transmits / receives data to / from the server 407. In the present embodiment, the communication with the server 407 is performed by wire, but the communication with the server 407 may be performed wirelessly.

The server 407 is a communication device that receives a data transfer request requesting data transmission and returns a response including the requested data, and is assumed to be, for example, an HTTP server (Web server), an FTP server, or the like. However, it is not limited to this as long as it has a function of returning the requested data. It may be a communication device operated by a user such as a PC or a smartphone. Further, the base station 400 may be communicated wirelessly.

When the STA belonging to the BSS of the base station 400 issues a data transfer request to the server 407, a packet related to the data transfer request is transmitted to the base station 400. The base station 400 receives this packet via the antennas 42A to 42D, and the receiving unit 403 executes processing of the physical layer and the like, and the communication processing unit 401 executes processing of the MAC layer and the like.

The network processing unit 404 analyzes the packet received from the communication processing unit 401.
Specifically, check the destination IP address, destination port number, and the like. When the data in the packet is a data transfer request such as an HTTP GET request, the network processing unit 404 determines that the data requested in this data transfer request (for example, the data existing in the URL requested in the HTTP GET request) is Check if it is cached (stored) in memory 406. The memory 406 stores a table in which a URL (or its reduced representation, for example, a hash value or an alternative identifier) is associated with data. Here, the fact that the data is cached in the memory 406 is expressed as the existence of the cached data in the memory 406.

When the cache data does not exist in the memory 406, the network processing unit 404 transmits a data transfer request to the server 407 via the wired I / F 405. That is, the network processing unit 404 transmits a data transfer request to the server 407 on behalf of the STA. Specifically, the network processing unit 404 generates an HTTP request, performs protocol processing such as adding a TCP / IP header, and passes the packet to the wired I / F 405. The wired I / F 405 transmits the received packet to the server 407.

The wired I / F 405 receives a packet from the server 407 that is a response to the data transfer request. The network processing unit 404 grasps that the packet is addressed to the STA from the IP header of the packet received via the wired I / F 405, and passes the packet to the communication processing unit 401. The communication processing unit 401 executes the processing of the MAC layer for this packet, the transmission unit 402 executes the processing of the physical layer, and the like, and the packet addressed to the STA is transmitted from the antennas 42A to 42D. Here, the network processing unit 404 associates the data received from the server 407 with the URL (or its reduced expression) and stores it in the memory 406 as cache data.

When the cache data exists in the memory 406, the network processing unit 404 reads the data requested by the data transfer request from the memory 406 and transmits this data to the communication processing unit 401. Specifically, an HTTP header or the like is added to the data read from the memory 406, protocol processing such as addition of a TCP / IP header is performed, and a packet is transmitted to the communication processing unit 401. At this time, as an example, the source IP address of the packet is set to the same IP address as the server, and the source port number is also set to the same port number as the server (the destination port number of the packet transmitted by the communication terminal). Therefore, from the viewpoint of STA, it looks as if it is communicating with the server 407. The communication processing unit 401 executes the processing of the MAC layer for this packet, the transmission unit 402 executes the processing of the physical layer, and the like, and the packet addressed to the STA is transmitted from the antennas 42A to 42D.

By such an operation, the frequently accessed data responds based on the cache data stored in the memory 406, and the traffic between the server 407 and the base station 400 can be reduced. The operation of the network processing unit 404 is not limited to the operation of the present embodiment. Any general cache proxy that fetches data from server 407 instead of STA, caches the data in memory 406, and responds to data transfer requests for the same data from the cached data in memory 406. For example, there is no problem with another operation.

The base station (access point) of the present embodiment can be applied as the base station of any of the above-described embodiments. The transmission of frames, data or packets used in any of the above embodiments may be performed using the cached data stored in memory 406. Further, the information obtained by the frame, data or packet received by the base station of any of the above-described embodiments may be cached in the memory 406. In any of the embodiments described above, the frame transmitted by the access point may include cached data or information based on the data. The information based on the data may be, for example, information on the size of the data or information on the size of the packet required for transmitting the data. It may also be information such as a modulation method required for data transmission. In addition, information on the presence or absence of data addressed to the terminal may be included.

The base station (access point) of the present embodiment can be applied as the base station of any of the above-described embodiments. In the present embodiment, a base station having a cache function has been described, but a terminal (STA) having a cache function can also be realized with the same block configuration as in FIG. In this case, the wired I / F 405 may be omitted. The transmission of frames, data or packets by the terminal in any of the above embodiments may be performed using the cached data stored in the memory 406. Further, the information obtained by the frame, data or packet received by the terminal of any of the above-described embodiments may be cached in the memory 406. In any of the embodiments described above, the frame transmitted by the terminal may include cached data or information based on the data. The information based on the data may be, for example, information on the size of the data or information on the size of the packet required for transmitting the data. It may also be information such as a modulation method required for data transmission. In addition, information on the presence or absence of data addressed to the terminal may be included.

(Fifth Embodiment)
FIG. 15 shows an overall configuration example of a terminal (a terminal of a non-access point) or an access point. This configuration example is an example, and the present embodiment is not limited thereto. The terminal or access point includes one or more antennas 1 to n (n is an integer of 1 or more), a wireless LAN module 148, and a host system 149. The wireless LAN module 148 corresponds to the wireless communication device according to any one of the above-described embodiments. The wireless LAN module 148 includes a host interface, which is connected to the host system 149. In addition to being connected to the host system 149 via a connection cable, it may be directly connected to the host system 149. Further, the wireless LAN module 148 can be mounted on the board by solder or the like and connected to the host system 149 via the wiring of the board. The host system 149 communicates with an external device by using the wireless LAN module 148 and the antennas 1 to n according to an arbitrary communication protocol.
The communication protocol may include TCP / IP and a higher layer protocol. Alternatively, TCP / IP may be mounted on the wireless LAN module 148, and the host system 149 may execute only the protocol of the upper layer thereof. In this case, the configuration of the host system 149 can be simplified. This terminal is, for example, a mobile terminal, TV, digital camera, wearable device, tablet, smartphone, game device, network storage device, monitor, digital audio player, Web camera, video camera, project, navigation system, external adapter, internal It may be an adapter, a set-top box, a gateway, a printer server, a mobile access point, a router, an enterprise / service provider access point, a portable device, a handheld device, a car, or the like. In addition to IEEE802.11, the wireless LAN module 148 (or wireless communication device) may have functions of other wireless communication standards such as LTE (Long Term Evolution) or LTE-Advanced (standards for mobile phones). ..

FIG. 16 shows an example of the hardware configuration of the wireless LAN module. This configuration is applicable when the wireless communication device is mounted on either a non-access point terminal or an access point. That is, it can be applied as an example of a specific configuration of the wireless communication device in any of the above-described embodiments. In this configuration example, the number of antennas is only one, but two or more antennas may be provided. In this case, a plurality of sets of a transmission system (216, 222 to 225), a reception system (217, 232 to 235), a PLL 242, a crystal oscillator (reference signal source) 243, and a switch 245 are arranged corresponding to each antenna. Each set may be connected to the control circuit 212. The PLL 242, the crystal oscillator 243, or both correspond to the oscillator according to this embodiment.

The wireless LAN module (wireless communication device) includes a baseband IC (Integrated Circuit) 211, an RF (Radio Frequency) IC 221, a balun 225, a switch 245, and an antenna 247.

The baseband IC 211 includes a baseband circuit (control circuit) 212, a memory 213, a host interface 214, a CPU 215, a DAC (Digital to Analog Converter) 216, and an ADC (Analog to Digital Converter) 217.

The baseband IC 211 and the RF IC 221 may be formed on the same substrate. Further, the baseband IC 211 and the RF IC 221 may be configured by one chip. DAC216 and / or ADC217 may be located in the RF IC 221 or in another IC. Further, the memory 213 and / or the CPU 215 may be arranged in an IC different from the baseband IC.

The memory 213 stores data to be transferred to and from the host system. Further, the memory 213 stores information notified to the terminal or the access point, information notified from the terminal or the access point, or both of them. Further, the memory 213 may store a program necessary for executing the CPU 215 and may be used as a work area when the CPU 215 executes the program. The memory 213 may be a volatile memory such as SRAM or DRAM, or a non-volatile memory such as NAND or MRAM.

The host interface 214 is an interface for connecting to the host system. The interface may be anything such as UART, SPI, SDIO, USB, PCI Express and the like.

The CPU 215 is a processor that controls the baseband circuit 212 by executing a program. The baseband circuit 212 mainly processes the MAC layer and the physical layer. The baseband circuit 212, CPU 215, or both correspond to a communication control device that controls communication, or a control unit that controls communication.

At least one of the baseband circuit 212 and the CPU 215 includes a clock generation unit that generates a clock, and the internal time may be managed by the clock generated by the clock generation unit.

The baseband circuit 212 performs addition, coding, encryption, modulation processing (may include MIMO modulation) of a physical header as a processing of a physical layer on a frame to be transmitted, and for example, two types of digital baseband signals (may include MIMO modulation). Hereinafter, a digital I signal and a digital Q signal) are generated.

The DAC 216 performs DA conversion of the signal input from the baseband circuit 212. More specifically, the DAC 216 converts a digital I signal into an analog I signal and a digital Q signal into an analog Q signal. It should be noted that there may be a case where the signal of one system is transmitted as it is without quadrature modulation. When a plurality of antennas are provided and transmission signals of one system or a plurality of systems are distributed and transmitted by the number of antennas, a number of DACs or the like corresponding to the number of antennas may be provided.

The RF IC 221 is, for example, an RF analog IC, a high frequency IC, or both of them. The RF IC 221 includes a filter 222, a mixer 223, a preamplifier (PA) 224, a PLL (Phase Locked Loop: phase-locked loop) 242, a low noise amplifier (LNA), a balun 235, a mixer 233, and a filter 232. Some of these elements may be located on baseband IC211 or another IC. The filters 222 and 232 may be a band pass filter or a low pass filter.

The filter 222 extracts a signal in a desired band from each of the analog I signal and the analog Q signal input from the DAC 216. The PLL 242 uses an oscillation signal input from the crystal oscillator 243, and divides or multiplies the oscillation signal, or both, to generate a signal having a constant frequency synchronized with the phase of the input signal. The PLL 242 includes a VCO (Voltage Controlled Oscillator), and obtains a signal having the constant frequency by performing feedback control using the VCO based on the oscillation signal input from the crystal oscillator 243. The generated constant frequency signal is input to the mixer 223 and the mixer 233. The PLL 242 corresponds to an example of an oscillator that generates a signal having a constant frequency.

The mixer 223 up-converts the analog I signal and the analog Q signal that have passed through the filter 222 to a radio frequency by using a signal having a constant frequency supplied from the PLL 242. The preamplifier (PA) 224 amplifies the radio frequency analog I and Q signals generated by the mixer 223 to the desired output power. The balun 225 is a converter for converting a balanced signal (differential signal) into an unbalanced signal (single-ended signal). The RF IC 221 handles balanced signals, but since the unbalanced signals are handled from the output of the RF IC 221 to the antenna 247, the balun 225 performs these signal conversions.

The switch 245 is connected to the transmitting side balun 225 during transmission and to the receiving side low noise amplifier (LNA) 234 or RF IC221 during reception. The control of the switch 245 may be performed by the baseband IC211 or the RF IC221, or another circuit for controlling the switch 245 may exist, and the switch 245 may be controlled from the circuit.

The analog I signal and analog Q signal of the radio frequency amplified by the preamplifier 224 are balanced-unbalanced converted by the balun 225, and then radiated as radio waves from the antenna 247 into space.

The antenna 247 may be a chip antenna, an antenna formed by wiring on a printed circuit board, or an antenna formed by using a linear conductor element.

The LNA 234 in the RF IC 221 amplifies the signal received from the antenna 247 via the switch 245 to a level that can be demodulated while keeping the noise low. The balun 235 performs an unbalanced-equilibrium conversion of the signal amplified by the low noise amplifier (LNA) 234. The order of the balun 235 and the LNA 234 may be reversed. The mixer 233 down-converts the received signal converted into the balanced signal by the balun 235 to the baseband using the signal of a constant frequency input from the PLL 242. More specifically, the mixer 233 has means for generating carriers that are 90 ° out of phase with each other based on the constant frequency signal input from the PLL 242, and the received signals converted by the balun 235 are 90 ° to each other. Orthogonal demodulation is performed by the out-of-phase carrier to generate an I (In-phase) signal having the same phase as the received signal and a Q (Quad-phase) signal having a phase delayed by 90 ° from the I (In-phase) signal. The filter 232 extracts a signal having a desired frequency component from these I signal and Q signal. The I signal and Q signal extracted by the filter 232 are output from the RF IC 221 after the gain is adjusted.

The ADC 217 in the baseband IC 211 AD-converts the input signal from the RF IC 221. More specifically, the ADC 217 converts the I signal into a digital I signal and the Q signal into a digital Q signal. In some cases, only one system of signals may be received without orthogonal demodulation.

When a plurality of antennas are provided, the number of ADCs may be provided according to the number of antennas. Based on the digital I signal and the digital Q signal, the baseband circuit 212 performs physical layer processing (may include MIMO demodulation) such as demodulation processing, error correction code processing, and physical header processing to obtain a frame. The baseband circuit 212 processes the MAC layer on the frame. If the baseband circuit 212 implements TCP / IP, the baseband circuit 212 can also be configured to perform TCP / IP processing.

The baseband circuit 212 performs the control unit 30 in FIG. 3 as an example. The antenna 247 may be a directional variable antenna. In this case, the switching control of the directivity pattern may be performed by the baseband circuit 212, the CPU 215, or the like.

(Sixth Embodiment)
FIG. 17 is a functional block diagram of the terminal (STA) 900 according to the seventh embodiment. The STA 900 includes a communication processing unit 901, a transmission unit 902, a reception unit 903, an antenna 91A, an application processor 904, a memory 905, and a second wireless communication module 906. The base station (AP) may have a similar configuration.

The communication processing unit 901 has the same function as the control unit described in the first embodiment. The transmitting unit 902 and the receiving unit 903 have the same functions as the transmitting unit and the receiving unit described in the first embodiment. Alternatively, the transmitting unit 902 and the receiving unit 903 correspond to the processing of the analog areas of the transmitting unit and the receiving unit described in the first embodiment, and the digital areas of the transmitting unit and the receiving unit described in the first embodiment. The processing may correspond to the communication processing unit 901. Here, the communication processing unit 901 may internally hold a buffer for passing data to and from the application processor 904. This buffer may be a volatile memory such as DRAM or a non-volatile memory such as NAND or MRAM.

The application processor 904 controls wireless communication via the communication processing unit 901, data writing / reading with the memory 905, and wireless communication via the second wireless communication module 906. The application processor 904 also executes various processes in the STA, such as Web browsing and multimedia processing such as video and music. The operation of the application processor 904 may be performed by processing software (program) by a processor such as a CPU, may be performed by hardware, or may be performed by both software and hardware.

The memory 905 stores data received by the receiving unit 903 and the second wireless communication module 906, data processed by the application processor 904, and the like. The memory 905 may be, for example, a volatile memory such as DRAM or a non-volatile memory such as NAND or MRAM. Further, SSD, HDD, SD card, eMMC and the like may be used. The memory 905 may be outside the access point 900.

As an example, the second wireless communication module 906 has the same configuration as the wireless LAN module shown in FIG. 15 or FIG. The second wireless communication module 906 executes wireless communication by a method different from the wireless communication realized by the communication processing unit 901, the transmitting unit 902, and the receiving unit 903. For example, when the communication processing unit 901, the transmission unit 902, and the reception unit 903 are wireless communications in accordance with the 802.11 standard, the second wireless communication module 906 may be another wireless communication module 906 such as Bluetooth®, LTE, Wireless HD, or the like. Wireless communication may be performed according to the wireless communication standard. Further, the communication processing unit 901, the transmission unit 902, and the reception unit 903 may execute wireless communication at 2.4 GHz / 5 GHz, and the second wireless communication module 906 may execute the radio frequency renewal at 60 GHz.

In this example, the number of antennas is one here, and the transmitting unit 902 / receiving unit 903 and the second wireless communication module 906 share the antenna. Here, the antenna may be shared by providing a switch for controlling the connection destination of the antenna 91A. Further, a plurality of antennas may be provided, and different antennas may be used for the transmitting unit 902 / receiving unit 903 and the second wireless communication module 906.

As an example, the communication processing unit 901 corresponds to a baseband integrated circuit, and the transmitting unit 902 and the receiving unit 903 correspond to an RF integrated circuit for transmitting and receiving frames. Here, the communication processing unit 901 and the application processor 904 may be configured by one integrated circuit (1 chip). Further, a part of the second wireless communication module 906 and the application processor 904 may be configured by one integrated circuit (1 chip).

The application processor controls wireless communication via the communication processing unit 901 and wireless communication via the second wireless communication module 906.

(7th Embodiment)
18 (A) and 18 (B) are perspective views of the wireless terminal according to the present embodiment. The wireless terminal of FIG. 18A is a notebook PC 301, and the wireless terminal of FIG. 18B is a mobile terminal 321. The notebook PC 301 and the mobile terminal 321 are equipped with wireless communication devices 305 and 315, respectively. As the wireless communication devices 305 and 315, the wireless communication device mounted on the wireless terminal described above, the wireless communication device mounted on the access point, or both of them can be used. The wireless terminal equipped with the wireless communication device is not limited to a notebook PC or a mobile terminal. For example, TVs, digital cameras, wearable devices, tablets, smartphones, game devices, network storage devices, monitors, digital audio players, web cameras, video cameras, projects, navigation systems, external adapters, internal adapters, set top boxes, gateways, etc. It can also be installed in printer servers, mobile access points, routers, enterprise / service provider access points, portable devices, handheld devices, automobiles, and the like.

Further, the wireless communication device mounted on the wireless terminal, the access point, or both of them can also be mounted on the memory card. FIG. 19 shows an example in which the wireless communication device is mounted on a memory card. The memory card 331 includes a wireless communication device 355 and a memory card main body 332. The memory card 331 utilizes a wireless communication device 355 for wireless communication with an external device (wireless terminal and / or access point, etc.). Note that in FIG. 19, the description of other elements (for example, memory, etc.) in the memory card 331 is omitted.

(8th Embodiment)
In the present embodiment, in addition to the configuration of the wireless communication device (the wireless communication device of the access point, the wireless communication device of the wireless terminal, or both) according to any one of the above-described embodiments, the bus, the processor unit, and the outside are added. It has an interface section. The processor unit and the external interface unit are connected to the external memory (buffer) via the bus. Firmware operates in the processor section. By including the firmware in the wireless communication device in this way, it is possible to easily change the function of the wireless communication device by rewriting the firmware. The processor unit on which the firmware operates may be a control unit or a processor that performs processing of the control unit according to the present embodiment, or may be another processor that performs processing related to function expansion or modification of the processing. good. The processor unit on which the firmware operates may be provided by the access point, the wireless terminal, or both of them according to the present embodiment. Alternatively, the processor unit may be provided with an integrated circuit in a wireless communication device mounted on an access point or an integrated circuit in a wireless communication device mounted on a wireless terminal.

(9th Embodiment)
In the present embodiment, in addition to the configuration of the wireless communication device (the wireless communication device of the access point, the wireless communication device of the wireless terminal, or both) according to any one of the above-described embodiments, a clock generation unit is provided. The clock generator generates a clock and outputs the clock from the output terminal to the outside of the wireless communication device. In this way, the clock generated inside the wireless communication device is output to the outside, and the host side is operated by the clock output to the outside, so that the host side and the wireless communication device side can be operated in synchronization with each other. It will be possible.

(10th Embodiment)
In the present embodiment, in addition to the configuration of the wireless communication device (the wireless communication device of the access point or the wireless communication device of the wireless terminal) according to any one of the above-described embodiments, the power supply unit, the power supply control unit, and the wireless power supply unit including. The power supply control unit is connected to the power supply unit and the wireless power supply unit, and controls to select the power supply to be supplied to the wireless communication device. In this way, by providing the wireless communication device with a power source, it is possible to perform a low power consumption operation in which the power source is controlled.

(11th Embodiment)
The present embodiment includes a SIM card in addition to the configuration of the wireless communication device according to any one of the above-described embodiments. The SIM card is connected to a transmitting unit, a receiving unit, a control unit, or a plurality of these in a wireless communication device. As described above, by providing the SIM card in the wireless communication device, the authentication process can be easily performed.

(12th Embodiment)
In this embodiment, in addition to the configuration of the wireless communication device according to any one of the above-described embodiments, a moving image compression / decompression unit is included. The moving image compression / decompression section is connected to the bus. As described above, by providing the moving image compression / decompression unit in the wireless communication device, it is possible to easily transmit the compressed moving image and decompress the received compressed moving image.

(13th Embodiment)
In the present embodiment, in addition to the configuration of the wireless communication device (the wireless communication device of the access point, the wireless communication device of the wireless terminal, or both) according to any one of the above-described embodiments, the LED unit is included. The LED unit is connected to a transmitting unit, a receiving unit, a control unit, or a plurality of these. By providing the LED unit in the wireless communication device in this way, it is possible to easily notify the user of the operating state of the wireless communication device.

(14th Embodiment)
The present embodiment includes a vibrator unit in addition to the configuration of the wireless communication device (access point wireless communication device, wireless terminal wireless communication device, or both) according to any one of the above-described embodiments. The vibrator unit is connected to a transmission unit, a reception unit, a control unit, or a plurality of these. By providing the vibrator unit in the wireless communication device in this way, it is possible to easily notify the user of the operating state of the wireless communication device.

(15th Embodiment)
The present embodiment includes a display in addition to the configuration of the wireless communication device (access point wireless communication device, wireless terminal wireless communication device, or both) according to any one of the above-described embodiments. The display may be connected to the control unit of the wireless communication device via a bus (not shown). By providing the display in this way and displaying the operating state of the wireless communication device on the display, it is possible to easily notify the user of the operating state of the wireless communication device.

(16th Embodiment)
In this embodiment, [1] a frame type in a wireless communication system, [2] a method of disconnecting a connection between wireless communication devices, [3] an access method of a wireless LAN system, and [4] a frame interval of a wireless LAN will be described.
[1] Frame type in communication system Generally, as described above, the frames handled on the wireless access protocol in a wireless communication system are roughly classified into three frames: a data frame, a management frame, and a control frame. It can be divided into types. These types are usually indicated by a header portion commonly provided between frames. As the display method of the frame type, one field may be capable of distinguishing three types, or a combination of two fields may be used to distinguish between the three types. In the IEEE802.11 standard, the frame type is identified by two fields, Type and Subtype in the Frame Control field in the frame header part of the MAC frame. The major classification of the data frame, the management frame, and the control frame is performed in the Type field, and the subtypes in the broadly classified frames, for example, the Beacon frame in the management frame, are discriminated in the Subtype field.

The management frame is a frame used for managing a physical communication link with another wireless communication device. For example, there are frames used to set communication with other wireless communication devices, frames for releasing (that is, disconnecting) communication links, and frames related to power saving operations in wireless communication devices. ..

A data frame is a frame in which data generated inside a wireless communication device is transmitted to another wireless communication device after a physical communication link is established with the other wireless communication device. The data is generated in the upper layer of the present embodiment, and is generated by, for example, a user operation.

The control frame is a frame used for control when transmitting / receiving (exchanged) a data frame with another wireless communication device. When the wireless communication device receives a data frame or a management frame, the response frame transmitted for confirmation of delivery belongs to the control frame. The response frame is, for example, an ACK frame or a BlockACK frame. The RTS frame and CTS frame are also control frames.

These three types of frames are processed as necessary in the physical layer and transmitted as physical packets via the antenna. In addition, the IEEE802.11 standard (the above-mentioned IEEE Std)
In (including extended standards such as 802.11ac-2013), there is an association process as one of the procedures for establishing a connection, but the Association Request frame and the Association Response frame used in it are the management frames, and the Association Request frame. Since the frame and the Association Response frame are unicast management frames, the receiving wireless communication terminal is requested to transmit the ACK frame which is the response frame, and this ACK frame is the control frame as described above.

[2] Method of disconnecting a connection between wireless communication devices There are an explicit method and an implicit method for disconnecting a connection (release). As an explicit method, one of the wireless communication devices having established a connection transmits a frame for disconnection. In the 802.11 standard, the 802.11ation frame corresponds to this and is classified as a management frame. Normally, the wireless communication device on the side of transmitting the frame that disconnects the connection disconnects the connection when the frame is transmitted, and the wireless communication device on the side that receives the frame that disconnects the connection receives the frame. judge. After that, if it is a non-base station wireless communication terminal, it returns to the initial state in the communication phase, for example, the state of searching for a BSS to be connected. When a wireless communication base station disconnects from a certain wireless communication terminal, for example, if the wireless communication base station has a connection management table that manages wireless communication terminals that subscribe to its own BSS, the connection management is performed. Delete the information related to the wireless communication terminal from the table. For example, when an AID is assigned at the stage where a wireless communication base station permits a connection to each wireless communication terminal that subscribes to its own BSS in the association process, the holding information associated with the AID of the wireless communication terminal that disconnected the connection is used. May be deleted and the AID may be released so that it can be assigned to another newly subscribed wireless communication terminal.

On the other hand, as an implicit method, a frame transmission (transmission of a data frame and a management frame, or transmission of a response frame to a frame transmitted by the own device) is detected from the wireless communication device of the connection partner that has established a connection for a certain period of time. If not, the connection status is determined to be disconnected.
There is such a method because, in the situation where the disconnection of the connection is determined as described above, the communication distance from the wireless communication device of the connection destination is long and the wireless signal cannot be received or decoded. This is because it is possible that the wireless link cannot be secured. That is, the reception of the frame that disconnects the connection cannot be expected.

A timer is used as a specific example of determining the disconnection by an implicit method. For example, when transmitting a data frame requesting a delivery confirmation response frame, a first timer (for example, a retransmission timer for a data frame) that limits the retransmission period of the frame is activated until the first timer expires (that is,). If the delivery confirmation response frame to the frame is not received (until the desired retransmission period elapses), retransmission is performed. The first timer is stopped when the delivery confirmation response frame to the frame is received.

On the other hand, when the first timer expires without receiving the delivery confirmation response frame, for example, it is confirmed whether the wireless communication device of the connection partner still exists (in the communication range) (in other words, whether the wireless link can be secured). At the same time, a second timer (for example, a retransmission timer for the management frame) that limits the retransmission period of the frame is activated. Similar to the first timer, the second timer retransmits if the delivery confirmation response frame to the frame is not received until the second timer expires, and when the second timer expires, it is determined that the connection is disconnected. .. When it is determined that the connection has been disconnected, a frame for disconnecting the connection may be transmitted.

Alternatively, when a frame is received from the wireless communication device of the connection partner, the third timer is activated, and each time a frame is newly received from the wireless communication device of the connection partner, the third timer is stopped and the frame is started again from the initial value. When the third timer expires, a management frame is sent to check whether the wireless communication device of the connection partner still exists (in other words, whether the wireless link is secured) as described above. At the same time, a second timer (for example, a retransmission timer for a management frame) that limits the retransmission period of the frame is activated. In this case as well, if the delivery confirmation response frame to the frame is not received until the second timer expires, the retransmission is performed, and when the second timer expires, it is determined that the connection is disconnected. In this case as well, the frame for disconnecting the connection may be transmitted at the stage when it is determined that the connection has been disconnected.
The latter management frame for confirming whether the wireless communication device of the connection partner still exists may be different from the management frame in the former case. Further, as the timer for limiting the retransmission of the management frame in the latter case, the same timer as in the former case is used here as the second timer, but a different timer may be used.

[3] Access method of wireless LAN system For example, there is a wireless LAN system that assumes communication or competition with a plurality of wireless communication devices. In the 802.11 wireless LAN, CSMA / CA (Carrier Sense Multiple Access with Carrier Avoidance) is the basis of the access method. In the method of grasping the transmission of a certain wireless communication device and transmitting after a fixed time from the end of the transmission, the transmission is simultaneously performed by a plurality of wireless communication devices that have grasped the transmission of the wireless communication device, and as a result, the transmission is performed. , Radio signals collide and frame transmission fails. By grasping the transmission of a certain wireless communication device and waiting for a random time from the end of the transmission, the transmission by a plurality of wireless communication devices grasping the transmission of the wireless communication device is stochastically dispersed. Therefore, if there is only one wireless communication device obtained by subtracting the earliest time in the random time, the frame transmission of the wireless communication device is successful, and frame collision can be prevented. Since the acquisition of transmission rights is fair among a plurality of wireless communication devices based on a random value, the method adopting Carrier Availability is said to be a method suitable for sharing a wireless medium among a plurality of wireless communication devices. be able to.

[4] Wireless LAN frame interval The 802.11 wireless LAN frame interval will be described. The frame intervals used in the IEEE802.11 wireless LAN are distributed codeintion interface interface (DIFS), arbitration interframe space (AIFS), point codeination interface , Reduced interframe space (RIFS) and the like.

The definition of the frame interval is defined in the IEEE 802.11 wireless LAN as a continuous period in which the carrier sense idle should be confirmed and opened before transmission, and the exact period from the previous frame is not discussed. Therefore, in the description of the 802.11 wireless LAN system here, the definition is followed. In the 802.11 wireless LAN, the time to wait for random access based on CSMA / CA is the sum of the fixed time and the random time, and it can be said that this definition is used to clarify the fixed time.

DIFS and AIFS are frame intervals used when attempting to start frame exchange during a contention period that competes with other wireless communication devices based on CSMA / CA. DIFS is used when there is no distinction of priority by traffic type, and AIFS is used when priority is provided by traffic type (TID: Traffic Identifier).

Since the operations related to DIFS and AIFS are similar, they will be described mainly using AIFS below. In the 802.11 wireless LAN, access control including the start of frame exchange is performed at the MAC layer. Further, when QoS (Quality of Service) is supported when data is passed from the upper layer, the traffic type is notified together with the data, and the data is classified into priority at the time of access based on the traffic type. This access class is called an access category (AC: Access Category). Therefore, the AIFS value is provided for each access category.

PIFS is a frame interval for allowing access with priority over other competing wireless communication devices, and has a shorter period than either DIFS or AIFS value.
SIFS is a frame interval that can be used when transmitting a control frame of a response system or when frame exchange is continued in a burst after acquiring an access right once. EIFS is a frame interval that is activated when frame reception fails (it is determined that the received frame is an error).
RIFS is a frame interval that can be used when a plurality of frames are continuously transmitted to the same wireless communication device in a burst after the access right is once acquired, and while RIFS is used, the transmission partner's wireless communication device can be used. Does not request a response frame for.

Here, FIG. 20 shows an example of frame exchange during a conflict period based on random access in the 802.11 wireless LAN.

It is assumed that when a data frame (W_DATA1) transmission request is generated in a certain wireless communication device, the medium is recognized as busy medium as a result of carrier sense. In this case, the AIFS for a fixed time is vacated from the time when the carrier sense becomes idle, and then the data frame W_DATA1 is transmitted to the communication partner at a vacant random time (random backoff). If, as a result of the carrier sense, it is recognized that the medium is not busy, that is, the medium is idle, a fixed time AIFS is set from the time when the carrier sense is started, and the data frame W_DATA1 is communicated with the communication partner. Send to.

Random time is a pseudo-random integer derived from a uniform distribution between contention windows (CWs) given as integers from 0, multiplied by slot time. Here, the CW multiplied by the slot time is called the CW time width. The initial value of CW is given by CWmin, and each time it is retransmitted, the value of CW is increased until it reaches CWmax. Both CWmin and CWmax have values for each access category as in AIFS. In the wireless communication device of the transmission destination of W_DATA1, if the data frame is successfully received and the data frame is a frame requesting the transmission of the response frame, the occupation of the physical packet containing the data frame ends on the wireless medium. The response frame (W_ACK1) is transmitted after the SIFS time from the time point. When the wireless communication device that has transmitted W_DATA1 receives W_ACK1, it transmits the next frame (for example, W_DATA2) after SIFS time from the time when the physical packet containing W_ACK1 is occupied on the wireless medium within the transmission burst time limit. can do.

AIFS, DIFS, PIFS and AIFS are functions of SIFS and slot time, but SIFS and slot time are defined for each physical layer. In addition, parameters such as AIFS, CWmin, and CWmax for which values are set for each access category can be set for each communication group (BSS (Basic Service Set) in the IEEE802.11 wireless LAN), but default values are set. ..

For example, in the standardization of 802.11ac, SIFS is 16 μs and slot time is 9 μs, so that PIFS is 25 μs, DIFS is 34 μs, and the default value of the frame interval of access category BACKGROUND (AC_BK) in AIFS is 79 μs. The default frame spacing of BEST EFFORT (AC_BE) is 43 μs, the default frame spacing of VIDEO (AC_VI) and VOICE (AC_VO) is 34 μs, and the default values of CWmin and CWmax are 31 and 1023 for AC_BK and AC_BE, respectively. , AC_VI is 15 and 31, and AC_VO is 7 and 15. Note that EIFFS is basically the sum of SIFS and DIFS and the time length of the response frame when transmitting at the slowest essential physical rate. In a wireless communication device that can efficiently take EIFS, the occupancy time length of the physical packet carrying the response frame to the physical packet that activated EIFS can be estimated, and the sum of SIFS, DIFS, and the estimated time can be used. can.

The frame described in each embodiment may refer to an IEEE802.11 standard or a compliant standard such as Null Data Packet, which is called a packet.

The terms used in this embodiment should be broadly interpreted. For example, the term "processor" may include general purpose processors, central processing units (CPUs), microprocessors, digital signal processors (DSPs), controllers, microprocessors, state machines, and the like. In some circumstances, the "processor" may refer to an application-specific integrated circuit, field programmable gate array (FPGA), programmable logic circuit (PLD), and the like. "Processor" may refer to a combination of processing devices such as multiple microprocessors, a combination of DSPs and microprocessors, and one or more microprocessors that work with a DSP core.

As another example, the term "memory" may include any electronic component capable of storing electronic information. "Memory" includes random access memory (RAM), read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable PROM (EEPROM), and non-volatile. It may refer to random access memory (NVRAM), flash memory, magnetic or optical data storage, which can be read by a processor. If the processor reads and writes information to the memory, or both, then the memory can be said to communicate electrically with the processor. The memory may be integrated into the processor, again, it can be said that the memory is electrically communicating with the processor. Further, the circuit may be a plurality of circuits arranged on a single chip, or may be one or more circuits distributed on a plurality of chips or a plurality of devices.

Further, in the present specification, "at least one of a, b and / or c" is not only a combination of a, b, c, ab, ac, bc, abc, but also a combination. It is an expression including a plurality of combinations of the same elements such as aa, abb, a-ab-bc-c, and the like. Further, it is an expression that covers a configuration including elements other than a, b, and c, such as a combination of abcd.

It should be noted that the present invention is not limited to the above embodiment as it is, and at the implementation stage, the components can be modified and embodied within a range that does not deviate from the gist thereof. In addition, various inventions can be formed by an appropriate combination of the plurality of components disclosed in the above-described embodiment. For example, some components may be removed from all the components shown in the embodiments. In addition, components across different embodiments may be combined as appropriate.

1: Wireless communication device 10: Transmission block 100: Frame division unit 101: Block coding unit 102: Coded frame generation unit 103: Frame aggregation unit 104: PHY header generation unit 105: Transmission unit 106: Transmitted data storage unit 20 : Reception block 200: Reception unit 201: PHY header analysis unit 202: Probability synthesis unit 203: Decoding unit 204: Received data storage unit 30: Control unit 40: Wireless unit 41: Antenna 211: Baseband IC
213: Memory 214: Host interface 215: CPU
216: DAC
217: ADC
221: RF IC
222: Filter 223: Mixer 224: Amplifier 225, 235: Balun 242: PLL
243: Crystal oscillator 247: Antenna 245: Switch 148: Wireless LAN module 149: Host system 301: Notebook PC
305, 315, 355: Wireless communication device 321: Mobile terminal 331: Memory card 332: Memory card bodies 42A to 42D: Antenna 402: Transmitter 403: Receiver 401: Communication processing unit 404: Network processing unit 405: Wired I / F
406: Memory 407: Server 901: Communication processing unit 902: Transmission unit 903: Reception unit 91A: Antenna 904: Application processor 905: Memory 906: Second wireless communication module

Claims (14)

It has a processing unit and a transmitting unit.
The processing unit
The data is divided into a plurality of information bit strings based on the number of first bits, and the data is divided into a plurality of information bit strings.
Among the plurality of information bit strings, one or more first information bit strings having the first number of bits are defined as one or more first blocks.
Among the plurality of information bit strings, one or more third information bit strings having a padding bit added to one or more second information bit strings having bits smaller than the number of first bits is defined as one or more second blocks. ,
One or more first coded blocks to which a first error correction bit string having a second bit number is added to the one or more first blocks are generated.
For the one or more second blocks, one or more second coded blocks to which a second error correction bit string having the second number of bits is added are generated.
Two or more coded blocks of the one or more first coded blocks and the one or more second coded blocks are concatenated to generate a first coded frame.
A second coded frame is generated by concatenating two or more coded blocks of the one or more first coded blocks and the one or more second coded blocks.
The first coded frame and the second coded frame are aggregated to generate transmission packet data.
The transmitter is
To transmit the transmission packet data,
The first coded frame and the second coded frame are wireless communication devices having the same boundary as the boundary of the MAC frame. The wireless communication device according to claim 1, wherein the processing unit generates the transmission packet data by adding a PHY header to a bit string in which the first coded frame and the second coded frame are aggregated. .. The wireless communication device according to claim 2, wherein the processing unit adds the padding bit so that the third information bit string has the bit of the first bit number. It has a processing unit and a transmitting unit.
The processing unit
The data is divided into a plurality of information bit strings based on the number of first bits, and the data is divided into a plurality of information bit strings.
Among the plurality of information bit strings, one or more first information bit strings having the first bit number is set as the first block.
Among the plurality of information bit strings, the second information bit string having a bit smaller than the number of the first bits is defined as one or more second blocks.
One or more first coded blocks to which a first error correction bit string having a second bit number is added to the first block are generated.
One or more second coded blocks to which the second error correction bit string having the second number of bits is added are generated.
Two or more coded blocks of the one or more first coded blocks and the one or more second coded blocks are concatenated to generate a first coded frame.
A second coded frame is generated by concatenating two or more coded blocks of the one or more first coded blocks and the one or more second coded blocks.
The first coded frame and the second coded frame are aggregated to generate aggregated data.
The start address of the coded frame included in the aggregated data, the size and sequence number of the coded frame, the length of the code word of the coded frame, and the number of bits of the padding bit omitted in the last block of the coded frame. , A header containing at least one of the information about the padding bit is generated, and the header is added to the aggregated data to generate transmission packet data.
The transmitter is
To transmit the transmission packet data,
The first coded frame and the second coded frame are wireless communication devices having the same boundary as the boundary of the MAC frame. The processing unit generates the transmission packet data by adding a PHY header to a bit string in which the first coded frame and the second coded frame are aggregated.
The PHY header comprises information about the aggregated frame sizes of the first coded frame and the second coded frame.
The wireless communication device according to claim 4. When there is at least one of the first coded frames or the second coded frame for which retransmission is requested among the coded frames aggregated in the transmitted packet data that has been transmitted.
The processing unit
A third error correction bit string, which is a bit string having a third bit number larger than the second bit number, is generated for the information bit string in the block included in the frame for which the retransmitted request is made.
Generate a third coded block with a part or all of the third error correction bit string added.
The wireless communication device according to claim 2, claim 3 or claim 5. The wireless communication device according to any one of claims 1 to 6, wherein the processing unit performs block coding for each coded frame using the same method of coding. When the transmitting packet data is a receiving unit that receives the transmitted transmitted packet data and the transmitted packet data is packet data including a coded frame for which a retransmission is requested, each of the encoded frames for which the retransmission is requested is described above. A receiver that performs likelihood synthesis on the coded block and determines whether reception was successful.
The wireless communication device according to any one of claims 1 to 7, further comprising. At least one antenna,
The wireless communication device according to any one of claims 1 to 8. It has a processing unit and a transmitting unit.
The processing unit
The data is divided into a plurality of information bit strings based on the number of first bits, and the data is divided into a plurality of information bit strings.
Among the plurality of information bit strings, one or more first information bit strings having the first number of bits are defined as one or more first blocks.
Among the plurality of information bit strings, one or more third information bit strings having a padding bit added to one or more second information bit strings having bits smaller than the number of first bits is defined as one or more second blocks. ,
One or more first coded blocks to which a first error correction bit string having a second bit number is added to the one or more first blocks are generated.
For the one or more second blocks, one or more second coded blocks to which a second error correction bit string having the second number of bits is added are generated.
Two or more coded blocks of the one or more first coded blocks and the one or more second coded blocks are concatenated to generate a first coded frame.
A second coded frame is generated by concatenating two or more coded blocks of the one or more first coded blocks and the one or more second coded blocks.
The first coded frame and the second coded frame are aggregated to generate transmission packet data.
The transmitter is
The transmission packet data is transmitted, and the transmission packet data is transmitted.
When there is a frame for which retransmission is requested among the coded frames aggregated in the transmitted packet data that has already been transmitted,
The processing unit
A third error correction bit string, which is a bit string having a third bit number larger than the second bit number, is generated for the information bit string of the divided frame for which the retransmission request is made.
Generate a third coded block with a part or all of the third error correction bit string added.
The first coded frame and the second coded frame are wireless communication devices having the same boundary as the boundary of the MAC frame. The processing unit
The data is divided into a plurality of information bit strings based on the number of first bits, and the data is divided into a plurality of information bit strings.
Among the plurality of information bit strings, one or more first information bit strings having the first number of bits are defined as one or more first blocks.
Among the plurality of information bit strings, one or more third information bit strings having a padding bit added to one or more second information bit strings having bits smaller than the number of first bits is defined as one or more second blocks. ,
One or more first coded blocks to which a first error correction bit string having a second bit number is added to the one or more first blocks are generated.
For the one or more second blocks, one or more second coded blocks to which a second error correction bit string having the second number of bits is added are generated.
Two or more coded blocks of the one or more first coded blocks and the one or more second coded blocks are concatenated to generate a first coded frame.
A second coded frame is generated by concatenating two or more coded blocks of the one or more first coded blocks and the one or more second coded blocks.
The first coded frame and the second coded frame are aggregated to generate transmission packet data.
The transmitter
To transmit the transmission packet data,
A wireless communication method in which the first coded frame and the second coded frame have the same boundary as the boundary of the MAC frame. The processing unit
The data is divided into a plurality of information bit strings based on the number of first bits, and the data is divided into a plurality of information bit strings.
Among the plurality of information bit strings, one or more first information bit strings having the first bit number is set as the first block.
Among the plurality of information bit strings, the second information bit string having a bit smaller than the number of the first bits is defined as one or more second blocks.
One or more first coded blocks to which a first error correction bit string having a second bit number is added to the first block are generated.
One or more second coded blocks to which the second error correction bit string having the second number of bits is added are generated.
Two or more coded blocks of the one or more first coded blocks and the one or more second coded blocks are concatenated to generate a first coded frame.
A second coded frame is generated by concatenating two or more coded blocks of the one or more first coded blocks and the one or more second coded blocks.
The first coded frame and the second coded frame are aggregated to generate aggregated data.
The start address of the coded frame included in the aggregated data, the size and sequence number of the coded frame, the length of the code word of the coded frame, and the number of bits of the padding bit omitted in the last block of the coded frame. , A header containing at least one of the information about the padding bit is generated, and the header is added to the aggregated data to generate transmission packet data.
The transmitter
To transmit the transmission packet data,
A wireless communication method in which the first coded frame and the second coded frame have the same boundary as the boundary of the MAC frame. The processing unit
The data is divided into a plurality of information bit strings based on the number of first bits, and the data is divided into a plurality of information bit strings.
Among the plurality of information bit strings, one or more first information bit strings having the first number of bits are defined as one or more first blocks.
Among the plurality of information bit strings, one or more third information bit strings having a padding bit added to one or more second information bit strings having bits smaller than the number of first bits is defined as one or more second blocks. ,
One or more first coded blocks to which a first error correction bit string having a second bit number is added to the one or more first blocks are generated.
For the one or more second blocks, one or more second coded blocks to which a second error correction bit string having the second number of bits is added are generated.
Two or more coded blocks of the one or more first coded blocks and the one or more second coded blocks are concatenated to generate a first coded frame.
A second coded frame is generated by concatenating two or more coded blocks of the one or more first coded blocks and the one or more second coded blocks.
The first coded frame and the second coded frame are aggregated to generate transmission packet data.
The transmitter
To transmit the transmission packet data,
It ’s a wireless communication method.
When there is a frame for which retransmission is requested among the coded frames aggregated in the transmitted packet data that has already been transmitted,
The processing unit
A third error correction bit string, which is a bit string having a third bit number larger than the second bit number, is generated for the information bit string of the divided frame for which the retransmission request is made.
Generate a third coded block with a part or all of the third error correction bit string added.
A wireless communication method in which the first coded frame and the second coded frame have the same boundary as the boundary of the MAC frame. It has a processing unit and a transmitting unit.
The processing unit
The first data, which is the first frame of the transmission packet data, is divided into a first bit string having a first bit number, and the first data is divided into first bit strings.
The second data, which is the second frame of the transmission packet data, is divided into a second bit string having the first bit number.
When the number of bits of one bit string in the first bit string is less than the number of bits of the first bit string, (1) the number of bits of the one bit string and (2) the number of the first bits. Add at least 1 bit of padding bit according to the difference between
When the number of bits in one bit string of the second bit string is less than the number of bits in the first bit string, (1) the number of bits in the one bit string and (2) the number of the first bits. Add at least 1 bit of padding bit according to the difference between
A parity bit string of the first error correction code having a second bit number is added to the first bit string to generate a first coded block.
A parity bit string of the second error correction code having the second bit number is added to the second bit string to generate a second coded block.
The first coded block is combined to form a first coded frame having a length that is an integral multiple of the total number of the first bit number and the second bit number, and the boundary of the first coded frame is a MAC frame. Generated to have the same boundary as the boundary of
The second coded block is combined to form a second coded frame having a length that is an integral multiple of the total number of the first bit and the second bit, and the boundary of the second coded frame is a MAC frame. Generated to have the same boundary as the boundary of
The transmission packet having a coded frame including the first coded frame and the second coded frame by aggregating the first coded frame and the second coded frame following the first coded frame. Generate data,
The transmitter is
To transmit the transmission packet data,
Wireless communication device.

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