JP5341711B2 - Wireless communication system - Google Patents

Description

  The present invention relates to a wireless communication system that performs wireless communication between networks defined by IEEE 802.3.

  2. Description of the Related Art A wireless communication system that wirelessly communicates between networks defined by IEEE 802.3, such as a LAN (Local Area Network) (hereinafter, “network defined by IEEE 802.3” is abbreviated as “network”). A frame defined by IEEE 802.3 (hereinafter, “frame defined by IEEE 802.3” is abbreviated as “frame”) is input asynchronously and in a burst manner with respect to processing related to wireless communication. For this reason, each time a wireless communication system stores a frame in a memory having a depth within a range in which transmission delay characteristics can be tolerated (hereinafter, “memory” is referred to as “wireless transmission buffer”), and transmits the frame wirelessly. In general, the frame stored in the wireless transmission buffer is read and the frame is transferred to a wireless processing block as a processing unit related to wireless communication (see, for example, Patent Document 1).

  The wireless processing block is wirelessly transmitted through wireless modulation processing and the like after encryption and channel coding. On the wireless reception side, a wireless processing block is obtained through wireless demodulation processing, channel decoding, encryption decoding, and the like. Thereafter, the wireless processing block is reassembled into the original frame, and the frame is output to the network.

JP-A-2005-223406

  When a frame is transferred to a wireless processing block, a frame having a variable length of several tens to several thousand bytes (frame length Le bytes) is divided into wireless processing blocks (wireless processing block length Lb bytes), and one frame is divided into a plurality of frames. There is a method (hereinafter, this method is referred to as a fragment) divided into wireless processing blocks. Conventionally, when performing fragmentation, when the frame length Le is shorter than the radio processing block length Lb or when the frame length Le is not a multiple of the radio processing block length Lb (Le = x · Lb + y, x: a natural number excluding 0, y : Natural number less than Lb excluding 0), it is necessary to insert dummy data that is not actual data into the fraction of the radio processing block. Therefore, depending on the relationship between the frame length Le and the radio processing block length Lb, there has been a problem that the data transmission efficiency of the radio communication system may be greatly reduced. To deal with this problem, it is conceivable to shorten the wireless processing block length Lb so as to minimize the dummy data to be inserted. However, the wireless reception side restores the frame fragmented with respect to the wireless processing block length Lb. Therefore, the ratio of the control information necessary for the increase becomes large, and there arises a problem that the data transmission efficiency is lowered.

  In order to solve the above problems, an object of the present invention is to provide a wireless communication system that can prevent a decrease in data transmission efficiency regardless of the relationship between the length of a frame and the length of a wireless processing block.

  In order to achieve the above object, the wireless communication system according to the present invention, when a frame (frame length Le bytes) from a network is fragmented in units of wireless processing blocks (wireless processing block length Lb bytes) and a fraction occurs. Then, a method of including the next frame in the same wireless processing block (hereinafter, this method is referred to as packing) is efficiently transferred to the wireless processing block.

  Specifically, the wireless communication system according to the present invention includes a storage process for storing frame data defined in IEEE 802.3 in the payload part of a wireless processing block including a header part and a payload part, and a payload part. A wireless device that performs frame formation processing to extract data and forms the frame; and a wireless transmission path that performs wireless communication in the wireless processing block and transmits data between the wireless devices.

  In the storage process, when the payload portion is all free space, the wireless device sequentially adds data with the frame length information, which is information on the length of the frame, from the beginning of the payload portion. When other data is stored in the payload part and there is an empty area, the data with the frame length information added to the head is stored in the empty area of the payload part after the other data. If the amount of data with the frame length information added to the head is larger than the free area of the payload part, the data exceeding the free area of the payload part is divided and If the frame length information is stored in the payload portion in order from the beginning of the payload portion of the wireless processing block, the top is placed at the beginning of the payload portion. And writes the first frame start position information indicating a position near the frame length information in the header portion of the wireless processing block.

  The wireless device packs and stores data with frame length information from the beginning of the payload portion of the wireless processing block. When an empty area occurs in the payload portion, the wireless device continuously stores data with the next frame length information. Further, when the amount of data to be stored is larger than the capacity of the payload portion, the wireless device stores data that cannot be stored in the payload portion of the next wireless processing block. Further, the wireless device writes first frame head position information indicating where in the payload portion the frame length information closest to the head of the payload portion is present in the header portion of the wireless processing block.

  By storing the frame data in the wireless processing block in this way, there is no need to insert dummy data. Furthermore, the wireless device can grasp the head position of data from the first frame head position information at the time of reception. Also, the wireless device can know the head position of the packed data by knowing the frame length information in the payload portion.

  Therefore, the present invention can provide a wireless communication system capable of preventing a decrease in data transmission efficiency regardless of the relationship between the frame length and the wireless processing block length.

  Preferably, the wireless device of the wireless communication system according to the present invention includes a wireless transmission buffer that classifies and temporarily stores the frame, and performs the storing process for each classification of the frame in the wireless transmission buffer. . The wireless device can improve the efficiency of data transmission because it can group the same type of frames and frames of the same destination.

  The wireless device of the wireless communication system according to the present invention is in a state where there is an empty area in the payload portion of the wireless processing block and the frame to be stored in the wireless processing block is waiting during the storing process. In this case, it is preferable to store dummy data with a dummy data identifier added to the head in the empty area of the payload.

  When there are few frames from the network, the wireless device fills the empty area of the payload portion with dummy data without waiting for the arrival of the next frame, and transmits the wireless processing block. Since the amount of data to be transmitted is small, the use of dummy data has little effect on the data transmission efficiency. Further, by inserting dummy data and continuously transmitting wirelessly, it is possible to improve transmission delay characteristics and transmission delay fluctuation characteristics, which are network performance.

  The wireless device of the wireless communication system according to the present invention uses the first frame head position information when the frame forming process includes the first frame head position information in the header portion of the wireless processing block. A data length indicating the amount of corresponding data is obtained from the frame length information at the indicated payload part position, and the length from the position of the frame length information to the last part of the payload part is determined from the data length. When the frame length information is long, a frame configuration is performed in which the data after the position of the frame length information is extracted from the payload portion and the frame is assembled, and the data length is from the position of the frame length information to the last portion of the payload portion. When the length is longer than the length, the one or more subsequent wireless processes are performed from the position of the frame length information to the length corresponding to the data length. When the frame structure for extracting the data dividedly stored in the payload part of the block and assembling the frame is performed, and the frame length information is further after the data subjected to the frame structure, the frame length The data length can be obtained from the information, and the frame configuration can be performed again.

  When receiving the radio processing block, the radio apparatus can know the end portion of the data using the frame length information even if the data is divided and stored in a plurality of radio processing blocks. In this case, it is not necessary to confirm the first frame head position information described in the header portion of the subsequent wireless processing block in which the data is stored.

  The wireless device of the wireless communication system according to the present invention uses the first frame head position information when the frame forming process includes the first frame head position information in the header portion of the wireless processing block. A data length indicating the amount of corresponding data is obtained from the frame length information at the indicated payload part position, and the length from the position of the frame length information to the last part of the payload part is determined from the data length. When the frame length information is long, a frame configuration is performed in which the data after the position of the frame length information is extracted from the payload portion and the frame is assembled, and the data length is from the position of the frame length information to the last portion of the payload portion. When the length is longer than the length, the position of the frame length information is set as a start position, and the one or more subsequent radio processing blocks are The wireless processing block in which the first frame head position information is written in the header portion is searched for, and the position in the payload portion indicated by the first frame head position information of the wireless processing block is detected as the end position. If the frame structure for extracting the data divided and stored from the start position to the end position and assembling the frame is constructed, and the frame length information is further behind the data having undergone the frame structure The data length can be obtained from the frame length information, and the frame configuration can be performed again.

  The wireless device may confirm all the header portions of the wireless processing block when receiving the wireless processing block. Even if the data is divided and stored in a plurality of wireless processing blocks, the wireless device is the data to be acquired up to the frame length information at the position indicated by the first frame head position information described in the header portion next. Can know.

  The present invention can provide a wireless communication system that can prevent a decrease in data transmission efficiency regardless of the relationship between the length of a frame and the length of a wireless processing block. In this wireless communication system, when transferring a frame to a wireless processing block, the data transmission efficiency is improved by fragment, packing, and dummy data insertion when the data transmission amount is large, and transmission delay characteristics and transmission are performed when the data transmission amount is small. The delay fluctuation characteristic can be kept good. Since this wireless communication system requires less control information to be realized, data transmission efficiency can be improved.

It is a schematic block diagram of the radio | wireless communications system which concerns on this invention. It is a conceptual diagram of the radio | wireless processing block in which the radio | wireless apparatus of the radio | wireless communications system which concerns on this invention performs radio | wireless communication. It is an example of the storage process of the radio | wireless communications system which concerns on this invention. It is an example of the storage process of the radio | wireless communications system which concerns on this invention. It is an example of the storage process of the radio | wireless communications system which concerns on this invention. It is a flowchart explaining the frame formation process of the radio | wireless communications system which concerns on this invention. It is a flowchart explaining the frame formation process of the radio | wireless communications system which concerns on this invention.

  Embodiments of the present invention will be described with reference to the accompanying drawings. The embodiments described below are examples of the present invention, and the present invention is not limited to the following embodiments. In the present specification and drawings, the same reference numerals denote the same components.

  FIG. 1 is a schematic configuration diagram of a wireless communication system 301 of the present embodiment. Since the wireless communication system 301 wirelessly transmits data between a plurality of LANs (11, 12), a wireless device (21, 22) connected to one end of the LAN (11, 12) and a wireless transmission path 31 And comprising. The LAN (11, 12) is a network defined by IEEE 802.3, and data is transmitted in a frame defined by IEEE 802.3.

  The wireless devices (21, 22) perform storage processing for storing frame data in a payload portion of a wireless processing block including a header portion and a payload portion, and frame forming processing for extracting data from the payload portion and forming a frame. The wireless transmission path 31 performs wireless communication with a wireless processing block, and transmits data between wireless devices (21, 22).

(Wireless processing block)
FIG. 2 is a conceptual diagram of a wireless processing block in which wireless devices (21, 22) perform wireless communication. The radio processing block is composed of two areas: a header part for storing control information and a payload part for storing frame data. Here, when the header length is Lh bytes, the payload length is Lp bytes, and the wireless processing block length is Lb bytes, Lb = Lh + Lp. Considering data transmission efficiency, it is desirable that Lh is sufficiently smaller than Lp (Lh << Lp). In the header part, control information such as (1) a radio processing block identifier, (2) a first frame head position, and (3) a radio processing block sequence number is described. Each control information is demonstrated below.

(1) Wireless processing block identifier The wireless processing block identifier identifies the applicable classification from all classifications when it is necessary to classify the frame input from the network for frame priority control and frame destination allocation. It is a value to do. When it is not necessary to classify a frame input from the network, the wireless processing block identifier may not be given.

(2) First frame head position The first frame head position is one piece of control information necessary for frame assembly on the radio reception side. The first frame head position is a value indicating the head position of the first data transferred from the frame to the payload section of the corresponding wireless processing block, and can be expressed by the number of bytes from the head of the wireless processing block or payload section. . Specifically, the first frame head position is the position of the first frame length information stored in the payload portion of the corresponding wireless processing block. The frame length information will be described later.

  Here, due to fragment, packing, or dummy data insertion processing, there may be a case where there is no data start position in the wireless processing block, or there may be a plurality of data start positions in one wireless processing block. A method is also conceivable in which the top position of data corresponding to the maximum number of frames that can be stored in the payload section of the corresponding wireless processing block is given. However, in this method, the start position of the data to be added increases as the payload length Lp becomes longer, and the start position of the determined data must be added regardless of the number of frames actually stored. For this reason, the data transmission efficiency is higher in the present embodiment in which only the first frame head position is given than in this method.

(3) Wireless processing block sequence number The wireless processing block sequence number is a value that is sequentially assigned to wireless processing blocks that are wirelessly transmitted. When there is a wireless processing block identifier, wireless processing for each wireless processing block identifier is performed. May be given to blocks independently and in sequence. Even if there is a risk that a wireless processing block that has been transmitted wirelessly will not reach the wireless reception side due to the propagation state of the wireless line, or may be discarded by wireless demodulation processing on the wireless reception side, etc. By monitoring the regularity of the numbers, it is possible to recognize the loss of the radio processing block.

(Store processing)
In the following description, the LAN 11 is assumed to be a wireless transmission side network and the LAN 12 is assumed to be a wireless reception side network. The same applies to the reverse case. For the frame (frame length Le bytes) input from the LAN 11, the wireless device 21 sets frame length information (frame length information length Li bytes) including a numerical value indicating the frame length Le at the head of the data extracted from the frame. Give. Thereafter, the wireless device 21 sequentially stores frame length information and data from the beginning of the payload portion of the wireless processing block. The frame length information is one piece of control information necessary for frame assembly performed by the wireless device 22.

  In the storage process, if the payload portion is all free space, the wireless device 21 stores the data with the frame length information, which is frame length information, added to the head in order from the beginning of the payload portion. When other data is stored in the payload portion and there is an empty area, the data with the frame length information added to the head is stored in the empty area of the payload portion in order from the rear of the other data and stored. If the amount of data with the length information added to the head is larger than the free space in the payload portion, the data that exceeds the free space in the payload portion is divided and sequentially from the top of the payload portion of the next wireless processing block. If there is frame length information in the payload part, the first frame head position information indicating the position of the frame length information closest to the head of the payload part is wirelessly processed. Written in the header portion of the block.

(1) When frame length information Li + data amount Le = payload portion capacity Lp When storing frame length information and frame data in a wireless processing block, the frame length information and frame data are stored without fragmentation or packing. Perform storage processing.

(2) Case of Frame Length Information Li + Data Amount Le> Payload Part Capacity Lp FIG. 3 shows an example of storage processing in this embodiment. When the frame length information (Li bytes) and the data amount (Le bytes) are larger than the capacity (Lp bytes) of the payload portion of the wireless processing block, the data of one frame is divided into a plurality of wireless processing block units. Do the fragment. In FIG. 3, the frame length information of Li bytes and the data of Le bytes are divided into Le1 bytes to Le4 bytes, respectively, and stored in the payload portions of the four wireless processing blocks of wireless processing block # 1 to wireless processing block # 4. . Here, each divided piece is stored from the beginning of the payload part of each wireless processing block (# 1 to # 4). If Le4 byte = Lp byte in the wireless processing block # 4 which is the last divided piece, the next frame may be stored from the beginning of the payload portion of the next wireless processing block. If Le4 byte <Lp byte in the wireless processing block # 4, the next frame is not stored from the beginning of the next wireless processing block, and the frame length information follows the remaining area (empty area) of the wireless processing block # 4. And packing to store data. As described above, the wireless communication system can improve the data transmission efficiency by performing the storing process so that the wireless device does not have an empty area in the wireless processing block.

  Here, the number of bytes from the beginning of the payload portion to the beginning of the frame length information is defined as the first frame beginning position. When frame length information is not included in the payload portion of the wireless processing block, the first frame head position is set to 0. In the fragment and packing processing example shown in FIG. 3, the first frame head position of the wireless processing block # 1 is 1, the first frame head position of the wireless processing block # 2 is 0, and the first frame head position of the wireless processing block # 3. Becomes 0. Further, in the wireless processing block # 4, when the frame length information of the next frame is stored in the empty area, the first frame head position of the wireless processing block # 4 is Le4 + 1. When dummy data to be described later is stored in the empty area, the first frame head position of the wireless processing block # 4 is 0.

(3) When Frame Length Information Li + Data Amount Le <Payload Part Capacity Lp FIG. 4 shows an example of storage processing in the present embodiment. When the frame length information (Li bytes) and the data amount (Le bytes) are smaller than the capacity (Lp bytes) of the payload portion of the wireless processing block, packing is performed so that data of a plurality of frames is stored in one wireless processing block. I do. In the example of packing processing shown in FIG. 4, frame length information and data (total Le1 bytes) of frame # 1, frame length information and data (total Le2 bytes) of frame # 2, and frame length information and data of frame # 3 Is stored in the payload part of the wireless processing block # 1. Furthermore, the remaining data of frame # 3 is packed from the beginning of the payload portion of the wireless processing block and stored. If there is an empty area in the wireless processing block # 2, the frame length information and data of the next frame are stored following the data of the frame # 3 in the payload portion of the wireless processing block # 2. As described above, the wireless communication system can improve the data transmission efficiency by performing the storing process so that the wireless device does not have an empty area in the wireless processing block.

  Here, if the first frame head position is defined in the same manner as described above, the first frame head position of the wireless processing block # 1 is 1 in the storage processing example shown in FIG. Furthermore, the first frame head position of the wireless processing block # 2 is Le3 ″ +1. When dummy data to be described later is stored in the empty area, the first frame head position of the wireless processing block # 2 is zero.

  Note that the length of the frame and the length of the payload portion of the radio processing block may be constantly monitored, and both fragmentation and packing may be performed by combining the storage processes (1) to (3) as described above.

  The wireless device 21 has a wireless transmission buffer (not shown) that classifies and temporarily stores frames, and performs storage processing for each frame classification in the wireless transmission buffer. When it is necessary to classify a frame input from the LAN 11 for frame priority control or frame destination allocation, the transmitting-side wireless device 11 has a wireless transmission buffer for each frame classification. The packing storage process is performed for each frame classification, and a radio processing block identifier corresponding to the classification is added to the header.

(Dummy data insertion)
If the wireless transmission buffer stores enough frames for at least one wireless processing block, the frame can be transferred to the wireless processing block and wirelessly transmitted by the storage process described above. However, since the frame from the LAN 11 is input in a burst manner asynchronously with the processing related to wireless communication, the frame is not always input intermittently. For example, if the wireless transmission is performed after waiting for a frame that can form one or more wireless processing blocks to be stored, the data transmission efficiency can be improved, but the transmission delay characteristics and transmission delay fluctuation characteristics of the LAN (11, 12) are affected. There is a risk of giving.

  When the wireless device 21 has an empty area in the payload portion of the wireless processing block and waits for a frame to be stored in the wireless processing block during the storage process, the wireless device 21 sets a dummy data identifier in the empty area of the payload. Stores dummy data added to the beginning.

  FIG. 5 shows an example of storage processing in the present embodiment. Even if the radio transmission buffer does not store enough frames to make up one or more radio processing blocks, the radio device inserts dummy data into all free areas of the radio processing block, and allows radio transmissions permitted in the radio communication system. Send radio processing blocks on the occasion. Dummy data may be inserted into the entire payload portion of the wireless processing block when the wireless transmission buffer is empty. In such a case, the amount of data transmission is relatively small, and even if dummy data is inserted, there is little influence on the data transmission efficiency. Fixed signal insertion (padding processing) is general dummy data insertion, but the wireless communication system 301 inserts pseudo-random numbers as dummy data in consideration of data randomness required in wireless modulation / demodulation processing or the like.

  The wireless communication system 301 identifies dummy data and valid data as follows. The transmitting-side radio apparatus 21 assigns an Nf-bit known signal as a dummy data identifier to the head of the dummy data. Then, a known signal having a signal pattern different from the Nf-bit dummy data identifier is added to the head of the frame length information as a valid data identifier. The radio device 22 on the receiving side can recognize that the dummy data identifier to the valid data identifier are dummy data.

  The wireless communication system 301 may identify dummy data and valid data as follows. As an alternative to the frame length information given to the head of the data, the wireless device 21 gives a signal having the same Li byte as the frame length information length as a dummy data identifier to the head of the dummy data. This signal is a signal that cannot be obtained by the frame length information of the effective data. The wireless device 22 can recognize the dummy data and the valid data without using the valid data identifier. Note that the dummy data identifier may be equal to or less than Li bytes as long as a signal that cannot be obtained with the frame length information of valid data can be expressed.

  As described above, the wireless communication system 301 performs storage processing for fragmenting and packing frames when the amount of data transmission is large, improving data transmission efficiency, and when the amount of data transmission is small, dummy data is stored in the payload portion. To maintain good transmission delay characteristics and transmission delay fluctuation characteristics.

(Frame forming process)
The wireless processing block generated by the storage processing described above is wirelessly transmitted from the wireless device on the transmission side through wireless modulation processing after encryption and channel coding. The radio device on the receiving side reassembles the original frame from the radio processing block obtained through radio demodulation processing, channel decoding, encryption decoding, and the like.

  The wireless device 22 performs a frame formation process as follows. First, when there is first frame head position information in the header portion of the wireless processing block, the wireless device 22 determines the amount of corresponding data from the frame length information at the position of the payload portion indicated by the first frame head position information. Get the data length indicating.

  Subsequently, when the length from the position of the frame length information to the last part of the payload portion is longer than the data length, the wireless device 22 takes out the data behind the position of the frame length information from the payload portion and assembles the frame. Perform frame configuration. On the other hand, when the data length is longer than the length from the position of the frame length information to the last part of the payload portion, the wireless device 22 performs one or more subsequent wireless processing blocks from the position of the frame length information to the length corresponding to the data length. A frame structure is formed in which the data divided and stored in the payload portion is taken out and a frame is assembled.

  Furthermore, when there is further frame length information after the data on which the frame configuration has been performed, the wireless device 22 obtains the data length from the frame length information and performs the frame configuration again.

  FIG. 6 is a flowchart for explaining frame formation processing of the wireless communication system 301. First, the wireless device 22 searches for a frame length information position for the wireless processing block (step S101). Specifically, the wireless device 22 reads the first frame head position included in the header portion of the wireless processing block, and knows the presence or absence of frame length information included in the payload portion (step S102). Furthermore, if there is frame length information, the wireless device 22 can grasp the position of the first frame length information included in the payload portion. If there is no frame length information in the wireless processing block, the wireless device 22 moves to the next wireless processing block (step S108), performs the same processing, and repeats this until the position of the frame length information is found.

  Once the frame length information position is found, the wireless device 22 reads a numerical value indicating the frame length included in the frame length information (step S103). In step S103, the end of the data is clarified, and the wireless device 22 grasps whether all the data is contained in the payload portion of the current wireless processing block or is divided and stored in the payload portion of the next wireless processing block. Yes (step S104). If all the data is contained in the payload portion of the current wireless processing block, the wireless device 22 can acquire data corresponding to the frame length information (referred to as data 1) (step S105), and performs the frame formation processing. This is performed (step S106). And the radio | wireless apparatus 22 confirms the presence or absence of frame length information after the data 1 (step S107). If there is frame length information in step S107, data of a plurality of frames is packed in one payload portion, and thus the wireless device 22 repeats steps S103 to S107. If there is no frame length information in step S107, the wireless device 22 proceeds to the next wireless processing block (step S108).

  When the data is divided and stored in the payload portion of the next wireless processing block in step S104, the wireless device 22 acquires data up to the last portion of the payload portion of the current wireless processing block (referred to as data 2). (Step S111). Then, the wireless device 22 proceeds to the next wireless processing block (step S112), and confirms whether the divided and stored data is contained in the payload portion of this wireless processing block (step S113). For example, since the length of the payload portion of the wireless processing block is determined, the wireless device 22 can grasp which wireless processing block has the end of the data stored separately by the acquired frame length information. .

  In step S113, when the divided and stored data does not fit in the payload portion of the current wireless processing block, the wireless device 22 acquires all the data (referred to as data 4) in the payload portion of the current wireless processing block. (Step S121), Step S112 to Step S113 are repeated. In step S113, when the terminal portion of the divided and stored data is in the payload portion of the current wireless processing block, the wireless device 22 transmits the data indicated by the frame length information from the beginning of the payload portion of the current wireless processing block. Data up to the end (referred to as data 3) is acquired (step S114). The wireless device 22 performs a frame forming process from the acquired data 2 to 4 (step S115), and performs step S107.

  If there is no next frame length information immediately after the end of the data indicated by the frame length information, or if there is a dummy data identifier, dummy data is stored after the end of the data. Further, since the valid data identifier or the dummy data identifier is included in the frame length information, the wireless device 22 can identify whether it is data or dummy data. If it is a valid frame (frame length information), the wireless device 22 can retrieve the fragmented or packed data again by reading the numerical value indicating the data length included in the frame length information. If it is dummy data, the radio | wireless apparatus 22 will move to the next radio | wireless processing block, and will search for a frame length information position again.

  Note that when acquiring separately stored data, the frame length information position may be searched for all wireless processing blocks obtained by the wireless device 22. When the data length is longer than the length from the position of the frame length information to the last part of the payload portion, the wireless device 22 starts the position of the frame length information as the start position, and sets the first one or more wireless processing blocks in the header portion. The wireless processing block in which the frame head position information is written is searched, the position in the payload portion indicated by the first frame head position information of the wireless processing block is detected as the end position, and divided and stored from the start position to the end position. The frame configuration is performed by taking out the data and assembling the frame.

  FIG. 7 is a flowchart for explaining frame formation processing of the wireless communication system 301. Only portions different from the flowchart of FIG. 6 will be described. When the process proceeds to the next radio processing block in step S112, the radio apparatus 22 confirms the header part again (step S213). In step S213, the wireless device 22 confirms whether or not the confirmed header portion includes the first frame head position information (step S214). When there is first frame head position information, the wireless device 22 sets data (data 3) from the head of the payload portion of the current wireless processing block to the frame length information at the position indicated by the first frame head position information. ) Is acquired (step S215). When there is no first frame head position information, the wireless device 22 checks whether there is a dummy identifier in the payload portion of the current wireless processing block (step S221). If there is a dummy identifier, the wireless device 22 acquires data 3 from the beginning of the payload portion of the current wireless processing block to the dummy identifier. If there is no dummy identifier, the wireless device 22 performs step S121 and again performs steps S112 to S214. The wireless device 22 performs a frame forming process from the acquired data 2 to 4 (step S115), and performs step S107.

  The radio communication system 301 notifies the radio channel disconnection from the radio demodulation processing when a momentary disconnection occurs due to the propagation state of the radio channel, and the rule of the radio processing block sequence number described in the header part of the radio processing block The loss of the wireless processing block can be recognized by monitoring the property. When recognizing the loss of the wireless processing block, the wireless device 22 discards any frame that is being assembled and starts again from the re-search for the frame length information position. Since the wireless communication system 301 can reliably grasp the frame length information by reading the first frame head position, the frame can be taken out as soon as the wireless line is restored.

  As described above, the wireless device 21 performs storage processing such as fragment, packing, and dummy data insertion using the control information of the first frame head position, frame length information, dummy data identifier, and valid data identifier. In addition, the wireless communication system 301 uses the control information to perform a frame forming process for assembling the original frame from the wireless processing block, so that the wireless communication system 301 is related to the relationship between the frame length and the wireless processing block length. Accordingly, it is possible to wirelessly communicate data between LANs while preventing a decrease in data transmission efficiency.

  When it is necessary to classify frames from the network for frame priority control or frame destination allocation, the receiving-side wireless device uses a wireless processing block identifier assigned to the header of the wireless processing block. After allocating the corresponding wireless processing block, it is reassembled into the original frame and output to the LAN.

  The wireless communication system according to the present invention can be applied to a wireless LAN, a wireless access system, and the like.

11, 12: LAN
21 and 22: wireless device 31: wireless transmission path 301: wireless communication system

Claims (4)

A wireless process for storing frame data defined by IEEE 802.3 in the payload part of a wireless processing block comprising a header part and a payload part, and a frame forming process for extracting data from the payload part and forming the frame Equipment,
A wireless transmission path for performing wireless communication in the wireless processing block and transmitting data between the wireless devices;
A wireless communication system comprising:
The wireless device includes:
During the storage process,
When the payload portion is all free space, data with frame length information, which is information on the length of the frame, added to the head is packed and stored in order from the head of the payload portion, and other data is stored in the payload portion. Is stored, and there is an empty area, the data with the frame length information added to the head is stored in the empty area of the payload portion in order from the back of the other data,
When the amount of data with the frame length information added to the head is larger than the free area of the payload portion, the data that exceeds the free area of the payload portion is divided, and the frame length information of the divided data is Without adding, store in order from the beginning of the payload portion of the next wireless processing block,
When the frame length information is present in the payload portion, first frame head position information indicating the position of the frame length information closest to the head of the payload portion is written in the header portion of the radio processing block. Wireless communication system.
  When the wireless device has a free area in the payload portion of the wireless processing block and waits for the frame to be stored in the wireless processing block during the storage process, the wireless device has the free area of the payload. 2. The wireless communication system according to claim 1, wherein dummy data with a dummy data identifier added to the head is stored. The wireless device includes:
During the frame forming process,
When there is the first frame head position information in the header part of the radio processing block, the amount of data corresponding to the frame length information at the position of the payload part indicated by the first frame head position information is calculated. Get the data length shown,
A frame configuration in which, when the length from the position of the frame length information to the last part of the payload portion is longer than the data length, the frame located after the position of the frame length information is extracted from the payload portion and the frame is assembled And when the data length is longer than the length from the position of the frame length information to the last part of the payload portion, the one or more subsequent radios from the position of the frame length information to a length corresponding to the data length Perform the frame configuration to take out the data divided and stored in the payload portion of the processing block and assemble the frame,
3. The frame length information is obtained from the frame length information when the frame length information is further after the data subjected to the frame configuration, and the frame configuration is performed again. The wireless communication system according to 1. The wireless device includes:
During the frame forming process,
When there is the first frame head position information in the header part of the radio processing block, the amount of data corresponding to the frame length information at the position of the payload part indicated by the first frame head position information is calculated. Get the data length shown,
A frame configuration in which, when the length from the position of the frame length information to the last part of the payload portion is longer than the data length, the frame located after the position of the frame length information is extracted from the payload portion and the frame is assembled And when the data length is longer than the length from the position of the frame length information to the last part of the payload portion, the position of the frame length information is set as a start position, and the header for one or more subsequent radio processing blocks Finding the wireless processing block in which the first frame head position information is written in the part, detecting the position in the payload part indicated by the first frame head position information of the wireless processing block as the end position, Assembling the frame by taking out the data divided and stored from the start position to the end position It performs frame configuration,
3. The frame length information is obtained from the frame length information when the frame length information is further after the data subjected to the frame configuration, and the frame configuration is performed again. The wireless communication system according to 1.

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