JP2003078565A - Wireless communication device - Google Patents

Abstract

(57) Abstract: An object of the present invention is to provide a wireless communication device that improves throughput in a wireless packet communication system. SOLUTION: In a data link transmission section of a wireless packet communication system, a plurality of IP packets are buffered.
By storing and transmitting the data in one data link frame, it is possible to reduce the overhead due to the header and the error correction code added in the data link layer and the physical layer, and improve the throughput.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication device for communicating data between a plurality of wireless terminals.

[0002]

2. Description of the Related Art Conventionally, regarding a wireless packet communication system composed of a plurality of terminals, for example, IEEE S
The data transmission method described in td 802.11-1997 is used. In this method, when the sending terminal receives an IP packet from the network layer,
If the size is 2312 bytes or less, a data link frame is constructed by adding a header of the data link layer and an error detection code to the packet, and a header used for processing in the physical layer is added in the physical layer. , Send the data.

The IP received from the network layer
If the packet size exceeds 2312 bytes,
The IP packet is divided into units called fragments of 2312 bytes or less, and a data link frame is constructed by adding a header and an error detection code of the data link layer for each fragment, and is further processed in the physical layer in the physical layer. Add the header to be used and send the data. After receiving the physical layer header of the received signal, the receiving terminal refers to the header of the data link frame so that the destination address matches its own address, and the error detection code indicates that the packet contains an error. If it is determined that there is no data link, the part from which the data link header and the error detection code are removed is passed to the network layer as an IP packet, and a packet called Ack for transmission confirmation is transmitted to the transmission terminal. The transmitting terminal determines that the packet has been successfully transmitted when receiving the delivery confirmation packet Ack from the destination terminal.

If the delivery confirmation packet Ack is not returned from the destination terminal within a fixed time, the packet transmitted immediately before is transmitted again to the destination terminal. Communication is established by repeating these series of operations.

[0005]

With the recent development of multimedia element technology, there is an increasing demand for communication of high-speed and large-capacity data such as moving images. In addition, wireless packet communication systems that do not require cable wiring have become widespread in offices and homes at present due to the speeding up and cost reduction. However, in the conventional wireless packet communication system, the overhead due to the header and the error correction code in the data link layer and the physical layer is large as compared with the wired packet communication system, and only one IP packet is stored in one data link frame. Therefore, there is a first problem that the effective transmission rate is significantly reduced when IP packets having a small packet size are continuously transmitted.

Further, in the conventional wireless packet communication system, if the received frame contains an error due to error detection in the data link receiving unit, all the frames are discarded and retransmitted, so that the data link frame size is reduced. If it is large, there is a second problem that the transmission efficiency is lowered.

Therefore, the present invention is to solve the above-mentioned first problem, in which a plurality of IP packets from the network layer are stored together in a data link frame, so that the data link layer and the physical layer can store the IP packets. The purpose is to reduce the overhead caused by the header and error correction code and to increase the execution speed.

Further, the present invention is for solving the above-mentioned second problem, and an error is detected for each IP packet included in one data link frame, and when an error is detected, the IP is detected. By requesting retransmission in packet units, it is an object to suppress a decrease in transmission efficiency due to retransmission.

[0009]

According to the present invention, if the size of an IP packet is equal to or smaller than a predetermined value in the wireless communication device, the packet is held in a temporary buffer and the destination address is the same. When the sum of the sizes of certain IP packets exceeds a predetermined value, the packets are collectively transmitted in one data link frame, and the above object is achieved.

Further, according to the present invention, in the wireless communication device, an error detection code is added to each IP packet at the time of transmission, an error is detected for each IP packet at the time of reception, and an error is detected in a certain IP packet. Achieves the above object by requesting the transmitting terminal to retransmit only that packet.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION According to the first aspect of the present invention, in a wireless communication device, a plurality of IP packets having the same destination address are collectively transmitted in one data link frame to transmit data. It has the effect of reducing the overhead in the link layer and physical layer and improving the effective transmission rate.

The invention according to claim 1 of the present invention has an effect that a constant transmission efficiency can be secured by predetermining the size of the data stored in the buffer in the wireless communication device.

According to a third aspect of the present invention, in the wireless communication device, the size of the data stored in the buffer is calculated based on the past data such as the number of times of retransmission, and the value is set to the value that maximizes the transmission efficiency. The setting has the effect of ensuring high transmission efficiency even under various circumstances.

The invention according to claim 4 of the present invention has an effect that it is possible to cope with real-time data such as a moving image by defining the maximum time during which the IP packet can be held in the buffer in the wireless communication device. Have.

According to a fifth aspect of the present invention, the maximum time that can be held in the buffer for each IP packet is determined by using the upper layer protocol information of each IP packet in the wireless communication device. It has the effect of being able to flexibly deal with data having various required qualities.

The invention according to claim 6 of the present invention has an effect of efficiently extracting individual IP packets included in a data link frame.

According to a seventh aspect of the present invention, in a wireless communication device, a plurality of IP packets stored in a data link frame received at a data link layer are sequentially passed to a network layer, whereby It has an effect of keeping the interface with the network layer.

According to an eighth aspect of the present invention, when a data link frame is transmitted in a wireless communication device, an error detection code is added to each IP packet so that the receiving side individually This has the effect that error detection can be performed on the IP packet of.

According to the ninth aspect of the present invention, in the wireless communication device, when the data link frame is received, the error detection can be performed for each IP packet, and the error is detected. In this case, by retransmitting only the IP packet containing an error, it is possible to suppress an increase in traffic due to the retransmission.

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a block connection diagram of a data link transmission unit according to Embodiment 1 of the present invention.
The structure of the data link frame is shown in FIG. 2, and the block connection diagram of the data link receiving unit is shown in FIG.

In FIG. 1, 1 is an input terminal for inputting an IP packet, 2 is an output terminal for outputting a data link frame processed by a data link transmitting section, 11
Is a packet size discriminating unit for discriminating the packet size of the input IP packet, 12 is a buffer for holding a plurality of IP packets, and 13 is an I for storing the destination address and packet size of the IP packet.
P packet information storage unit, 14 is a packet size calculation unit that calculates the total size of IP packets with the same destination address stored in the buffer, and 15 is a timer that measures the time since the IP packets were stored in the buffer 12. ,
Reference numeral 16 is a data link frame configuration unit that configures a data link frame from an IP packet.

The operation of the above arrangement will be described below. In the data link transmitter of FIG. 1,
The IP packet 101 processed in the network layer not shown in the figure is the IP packet input terminal 1
Input from. Next, the packet size determination unit 11
If the IP packet size described in the header 31 is equal to or smaller than a predetermined value by referring to the header of the input IP packet 101, the IP packet 102 is passed to the buffer 12 and exceeds the predetermined value. , IP packet 1 in the data link frame construction unit 16
Pass 03.

The buffer 12 holds the IP packet for a certain period of time. The IP packet information storage unit 13 refers to the header of each IP packet held in the buffer 12 and stores the destination address of the IP packet and the packet size 104. Packet size calculator 14
Then, the destination address and packet size information 105 of each IP packet obtained from the IP packet information storage unit 13
Based on the above, the total size of IP packets stored in the buffer 12 and having the same destination address is calculated.

When the total size exceeds a predetermined value, a transmission permission signal 106 is sent to the buffer 12, and those IP packets 108 are passed from the buffer 12 to the data link frame construction section 16. Timer 15
It has a plurality of timers for each IP packet stored in the buffer 12, and each IP packet has a buffer 1
2 is measured, and when a predetermined time has elapsed, a transmission permission signal 107 is sent to the buffer 12, and an IP packet and a packet that have been stored for a predetermined time have been stored. Buffer 12 the IP packet 108 having the same destination address
To the data link frame construction unit 16.

The data link frame composing unit 16 composes the plurality of IP packets 108 received from the buffer 12 into the data link frame 1 having the frame structure shown in FIG.
09, the packet number information 24 indicating the number of IP packets contained in the data link frame, the packet head position information 25 indicating the head position of each IP packet, the destination address 26, the source address 2
A data link header 21 storing 7 etc. and a CRC 23 for error detection are added and passed from the data link frame output terminal 2 to the physical layer.

However, the data link frame structure shown in FIG. 2 is a case where four IP packets are stored, and the number of IP packets to be stored may be any number. Further, the information in the header 21 shows only representative information, and other information is also included. Further, the positions in the header 21 such as the packet number information 24 and the packet head position information 25 may not be the positions shown in FIG. Also, buffer 1
It is also conceivable that 2 is composed of a plurality of buffers corresponding to respective destination addresses.

In FIG. 3, 3 is a data link frame input terminal to which the data link frame processed in the physical layer is input, and 4 is I processed by the data link receiving unit.
An IP packet output terminal for outputting a P packet, 31 is a header processing unit that performs data link processing based on the header information of the input data link frame, and 32 is a cyclic redundancy check (CRC) 23 for the data link frame. Thus, the error detector 33 detects an error, and the packet extractor 33 extracts a plurality of IP packets contained in the data link frame.

In the data link receiving section of FIG. 3, the received signal processed in the physical layer not shown in the figure is input to the data link frame input terminal 3 as the data link frame 301. Header processing unit 31
Then, referring to the data link frame header 21, when the destination address 26 matches the address of the own station, the data link frame 302 is passed to the error detection unit 32,
If it does not match the address of the own station, the data link frame is discarded.

The error detection unit 32 performs error detection by the CRC 23 of the data link frame. If an error is detected, the data link frame is discarded, and if no error is detected, the data link frame 303 is detected. It is passed to the IP packet extraction unit 33. IP packet extraction unit 3
3, the packet number information and the packet position information included in the header 21 of the data link frame are used to extract each IP packet stored in the data storage unit 22 of the data link frame, and the extracted IP packet 304 is obtained. The packets are sequentially output from the IP packet output terminal 4 to the network layer.

However, in addition to the processing described here, processing by a normal data link is performed, but is omitted. Further, each wireless communication device does not necessarily have to have both the data link transmission unit and the reception unit described above, and may have only one of them.

(Embodiment 2) FIG. 4 is a block connection diagram of a data link transmission unit according to Embodiment 2 of the present invention.
The structure of the data link frame is shown in FIG. 2, and the block connection diagram of the data link receiving unit is shown in FIG.

In FIG. 4, 1 is an input terminal for inputting an IP packet, 2 is an output terminal for outputting a data link frame processed by the data link transmitting section, 11
Is a packet size discriminating unit for discriminating the packet size of the input IP packet, 12 is a buffer for holding a plurality of IP packets, 41 is a destination address of the IP packet, a packet size and upper protocol information. An IP packet information storage unit for storing the IP packet information, and 14 is an IP with the same destination address stored in the buffer 12.
A packet size calculation unit that calculates the total size of packets, 42 is a timer that measures the time after the IP packet is stored in the buffer 12, and 16 is a data link frame configuration unit that forms a data link frame from the IP packet. .

The operation of the above arrangement will be described below. In the data link transmitter of FIG. 4,
The IP packet 101 processed in the network layer not shown in the figure is the IP packet input terminal 1
Input from. Next, the packet size determination unit 11
If the IP packet size described in the header 31 is equal to or smaller than a predetermined value by referring to the header of the input IP packet 101, the IP packet 102 is passed to the buffer 12 and exceeds the predetermined value. , IP packet 1 in the data link frame construction unit 16
Pass 03.

The buffer 12 holds the IP packet for a certain period of time. The IP packet information storage unit 41 refers to the header of each IP packet held in the buffer 12 and stores the destination address, packet size, and upper protocol information 401 of the IP packet. The packet size calculation unit 14 calculates the total size of IP packets having the same destination address stored in the buffer 12 based on the destination address of each IP packet and the packet size information 105 obtained from the IP packet information storage unit 13. calculate. When the total size becomes equal to or larger than a predetermined value, the transmission permission signal 106 is sent to the buffer 12,
The IP packets 108 are passed from the buffer 12 to the data link frame construction unit 16.

The timer 42 has a plurality of timers for each IP packet stored in the buffer 12. When the IP packet 102 is stored in the buffer 12, the timer 42 is stored in the buffer 12 stored in the IP packet information storage unit 41. Upper protocol information 402 of the stored IP packet 102
If the upper protocol is a protocol used for immediate data such as RTP, set the timer end value to a value shorter than a predetermined standard timer end value. The timer end value of is set, the time after each IP packet is stored in the buffer 12 is measured, and when the timer end value of each packet is elapsed, the transmission permission signal 107 is sent to the buffer 12, The buffer 12 stores the IP packet that has passed the timer end value since it was stored and the IP packet 108 having the same destination address as the packet.
To the data link frame construction unit 16.

In the data link frame construction unit 16, the data link frame 1 having the frame construction shown in FIG.
09, the packet number information 24 indicating the number of IP packets contained in the data link frame, the packet head position information 25 indicating the head position of each IP packet, the destination address 26, the source address 2
A data link header 21 storing 7 etc. and a CRC 23 for error detection are added and passed from the data link frame output terminal 2 to the physical layer.

However, the data link frame configuration shown in FIG. 2 is a case where four IP packets are stored, and the number of IP packets to be stored may be any number. Further, the information in the header 21 shows only representative information, and other information is also included. Further, the positions in the header 21 such as the packet number information 24 and the packet head position information 25 may not be the positions shown in FIG. Also, buffer 1
It is also conceivable that 2 is composed of a plurality of buffers corresponding to respective destination addresses. Further, the timer end value of the timer 15 can be set more finely not only by using the upper layer protocol but also by using information indicating other allowable delay time.

The data link receiving section of FIG. 3 is the same as that of the first embodiment.

(Embodiment 3) FIG. 5 is a block connection diagram of a data link transmission unit according to Embodiment 3 of the present invention.
The structure of the data link frame is shown in FIG. 2, and the block connection diagram of the data link receiving unit is shown in FIG.

In FIG. 5, 1 is an input terminal for inputting an IP packet, 2 is an output terminal for outputting a data link frame processed by the data link transmitting section, 51
Is a packet size discriminating unit for discriminating the packet size of the input IP packet, 12 is a buffer for holding a plurality of IP packets, and 13 is an I for storing the destination address and packet size of the IP packet.
The P packet information storage unit 52 is a packet size calculation unit that calculates the total size of IP packets having the same destination address stored in the buffer 12, and 15 is the time after the IP packets are stored in the buffer 12. A timer, 16 is a data link frame configuration unit that configures a data link frame from an IP packet, and 53 is a transmission packet size determination unit that stores past transmission information such as the number of retransmissions and determines an optimum transmission packet size.

The operation of the above arrangement will be described below. In the data link transmitter of FIG. 5,
The IP packet 101 processed in the network layer not shown in the figure is the IP packet input terminal 1
Input from. Next, the packet size determination unit 51
If the IP packet size described in the header 31 is equal to or smaller than the value 501 set by the transmission packet size determination unit 53 with reference to the header of the input IP packet 101,
When the IP packet 102 is passed to the buffer 12 and exceeds the value 501 set by the transmission packet size determination unit 53, the IP packet 1 is sent to the data link frame configuration unit 16.
Pass 03. The transmission packet size determination unit 53 determines the optimum packet size based on past information such as the number of times of retransmission of the data link frame, and the optimum packet size 5
01 and 502 are transmitted to the packet size determination unit 51 and the packet size calculation unit 52.

For example, a value obtained by subtracting the size of the header 21 and the CRC 23 of the data link frame from the size of the data link frame having the smallest number of retransmissions from the past information is determined as the optimum packet size. Buffer 12
Holds the IP packet for a certain period of time. The IP packet information storage unit 13 refers to the header of each IP packet held in the buffer 12 and stores the destination address of the IP packet and the packet size 104.

In the packet size calculation unit 52, based on the destination address of each IP packet and the packet size information 105 obtained from the IP packet information storage unit 13, the IP address having the same destination address stored in the buffer 12 is stored.
Calculate the total size of the packet. When the total size becomes equal to or larger than the value 502 set by the transmission packet size determination unit, the transmission permission signal 106 is sent to the buffer 12, and those IP packets 108 are passed from the buffer 12 to the data link frame configuration unit 16.

The timer 15 has a plurality of timers for each IP packet stored in the buffer 12, measures the time after each IP packet is stored in the buffer 12, and when a predetermined time elapses. To
The transmission permission signal 107 is sent to the buffer 12, and an IP packet which has been stored for a predetermined time and an IP packet 108 having the same destination address as the packet are passed from the buffer 12 to the data link frame construction unit 16.

In the data link frame construction unit 16, the data link frame 1 having the frame construction shown in FIG.
09, the packet number information 24 indicating the number of IP packets contained in the data link frame, the packet head position information 25 indicating the head position of each IP packet, the destination address 26, the source address 2
A data link header 21 storing 7 etc. and a CRC 23 for error detection are added and passed from the data link frame output terminal 2 to the physical layer.

However, the data link frame structure shown in FIG. 2 is a case where four IP packets are stored, and the number of IP packets to be stored may be any number. Further, the information in the header 21 shows only representative information, and other information is also included. Further, the positions in the header 21 such as the packet number information 24 and the packet head position information 25 may not be the positions shown in FIG. Also, buffer 1
It is also conceivable that 2 is composed of a plurality of buffers corresponding to respective destination addresses. Also, these functions can be used at the same time as the function of setting the timer end value by the higher level protocol of the data link transmission unit described in the second embodiment.

The data link receiving section of FIG. 2 is the same as that of the first embodiment.

(Embodiment 4) FIG. 1 is a block connection diagram of a data link transmission unit according to Embodiment 4 of the present invention.
FIG. 2 shows a block connection diagram of the data link receiving unit, and FIG. 6 shows a configuration of the data link frame.

In FIG. 1, 1 is an input terminal for inputting an IP packet, 2 is an output terminal for outputting a data link frame processed by a data link transmitting unit, 11
Is a packet size discriminating unit for discriminating the packet size of the input IP packet, 12 is a buffer for holding a plurality of IP packets, and 13 is an I for storing the destination address and packet size of the IP packet.
P packet information storage unit, 14 is a packet size calculation unit for calculating the total size of IP packets having the same destination address stored in the buffer 12, and 15 is a time period after the IP packets are stored in the buffer 12. A timer, 16 is a data link frame configuration unit that configures a data link frame from an IP packet.

The operation of the above arrangement will be described below. In the data link transmitter of FIG. 1,
The IP packet 101 processed in the network layer not shown in the figure is the IP packet input terminal 1
Input from. Next, the packet size determination unit 11
If the IP packet size described in the header 31 is equal to or smaller than a predetermined value by referring to the header of the input IP packet 101, the IP packet 102 is passed to the buffer 12 and exceeds the predetermined value. , IP packet 1 in the data link frame construction unit 16
Pass 03.

The buffer 12 holds the IP packet for a certain period of time. The IP packet information storage unit 13 refers to the header of each IP packet held in the buffer 12 and stores the destination address of the IP packet and the packet size 104. Packet size calculator 14
Then, the destination address and packet size information 105 of each IP packet obtained from the IP packet information storage unit 13
Based on the above, the total size of IP packets stored in the buffer 12 and having the same destination address is calculated. When the total size exceeds a predetermined value, the transmission permission signal 106 is sent to the buffer 12, and those IP packets 108 are passed from the buffer 12 to the data link frame configuration unit 16. The timer 15 has a plurality of timers for each IP packet stored in the buffer 12, measures the time since each IP packet was stored in the buffer 12, and when a predetermined time has passed, the buffer The transmission permission signal 107 is sent to the packet 12, and the IP packet which has been stored for a predetermined time and the IP packet 108 having the same destination address as the packet are passed from the buffer 12 to the data link frame construction unit 16.

In the data link frame construction unit 16, the data link frame 1 having the frame construction shown in FIG.
09, the packet number information 34 indicating the number of IP packets contained in the data link frame, the packet start position information 35 indicating the start position of each IP packet, the destination address 36, and the source address 3
A data link header 31 storing 7 etc. is added.
Further, the CRC 61 for error detection calculated for each IP packet is added to the end of each IP packet and passed from the data link frame output terminal 2 to the physical layer.

However, the data link frame configuration shown in FIG. 6 is a case where four IP packets are stored, and the number of IP packets to be stored may be any number. Further, the information in the header 31 shows only representative information, and other information is also included. Further, the positions in the header 31 such as the packet number information 34 and the packet head position information 35 may not be the positions shown in FIG. Also, buffer 1
It is also conceivable that 2 is composed of a plurality of buffers corresponding to respective destination addresses.

In FIG. 3, 3 is a data link frame input terminal to which a data link frame processed in the physical layer is input, and 4 is an I processed by the data link processing unit.
An IP packet output terminal for outputting a P packet, 31 is a header processing unit that performs data link processing based on the header information of the input data link frame, and 32 is a cyclic redundancy check of individual IP packets included in the data link frame. An error detection unit that detects an error by calculating (CRC) 61, and a packet extraction unit 33 that extracts a plurality of IP packets included in the data link frame.

In the data link receiving section of FIG. 3, the received signal processed in the physical layer not shown in the figure is input to the data link frame input terminal 3 as the data link frame 301. Header processing unit 31
Then, referring to the data link frame header 21, when the destination address 26 matches the address of the own station, the data link frame 302 is passed to the error detection unit 32,
If it does not match the address of the own station, the data link frame is discarded.

The error detector 32 uses the packet number information and packet position information included in the header 21 of the data link frame to detect an error for each IP packet by the CRC 61 added to the end of each IP packet. If an error is detected, the IP packet number including the error is passed to the IP packet extraction unit 33. This IP packet has the same IP number on the sending side and the receiving side.
It is designed to show packets.

After that, the data link frame 303 is set to I
It is passed to the P packet extraction unit 33. IP packet extraction unit 33
Then, using the packet number information and the packet position information included in the header 21 of the data link frame, each IP packet stored in the data storage section 22 of the data link frame is extracted, and the error detection section 32 detects an error. When the number of the IP packet including the is known, the IP packet is discarded, and the other IP packets 304 are sequentially output from the IP packet output terminal 4 to the network layer. If there is an IP packet containing an error, a retransmission request frame with the IP packet number added is transmitted to the transmitting terminal.

When the transmission terminal receives the retransmission request frame, it retransmits the IP packet having the number shown in the frame. However, other than the processing described here, processing by a normal data link is performed, but is omitted.
It is also possible to detect an error after extracting the IP packet.

However, each wireless communication device does not necessarily have to have both the data link transmission unit and the reception unit described above, and may have only one of them. Further, it is possible to use the functions at the same time as the functions of the second and third embodiments.

[0061]

As described above, the effects of the present invention are as follows.
In a wireless packet communication system, when the IP packet size from the network layer is small, the packets are stored in one data link frame and transmitted, so that a header added to the data link frame and the physical layer and error detection are performed. It is possible to reduce the overhead due to the code and improve the effective transmission rate.

Further, according to the present invention, in a wireless packet communication system, when an error occurs in a data link frame due to a propagation path condition or the like, a request for retransmission is made for each IP packet included in the data link frame. It is possible to suppress a decrease in transmission efficiency.

[Brief description of drawings]

FIG. 1 is a block connection diagram of a data link transmission unit of a wireless communication device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a frame format of a data link frame.

FIG. 3 is a block connection diagram of a data link receiving unit of the wireless communication device according to the first embodiment of the present invention.

FIG. 4 is a block connection diagram of a data link transmission unit of a wireless communication device according to a second embodiment of the present invention.

FIG. 5 is a block connection diagram of a data link transmission unit of a wireless communication device according to a third embodiment of the present invention.

FIG. 6 is a diagram showing a frame format of a data link frame.

[Explanation of Codes] 1 IP packet input terminal 2 Data link frame output terminal 3 Data link frame input terminal 4 IP packet output terminal 11, 51 Packet size determination unit 12 Buffer 13, 41 IP packet information storage unit 14, 52 Packet size calculation Units 15 and 42 Timer 16 Data link frame configuration unit 21 Header 22 Data storage unit 23 CRC 24 Packet number information 25 Packet head position information 26 Destination address 27 Source address 31 Header processing unit 32 Error detection unit 33 IP packet extraction unit 53 Transmission Packet size determination unit 61 CRC for each IP packet 101, 102, 103, 108, 304 IP packet 109, 301, 302, 303 Data link frame 104, 105, 401, 402 IP packet information 106, 10 7 IP packet transmission permission signals 501, 502 Transmission packet size optimum value

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Taisuke Matsumoto             3-10-1 Higashisanda, Tama-ku, Kawasaki City, Kanagawa Prefecture             No. Matsushita Giken Co., Ltd. (72) Inventor Yoshinori Watanabe             3-10-1 Higashisanda, Tama-ku, Kawasaki City, Kanagawa Prefecture             No. Matsushita Giken Co., Ltd. F-term (reference) 5K030 GA01 HA08 LA01 LE13                 5K033 AA01 CB01 CB04 CC01 DA17                       DB13 DB14 DB16

Claims (9)

[Claims] 1. A wireless communication device comprising means for collectively transmitting or receiving a plurality of IP packets having the same destination address in one data link frame. 2. When an IP packet from the network layer is input and the size of the IP packet is less than or equal to a predetermined threshold value, the destination address of the IP packet is referred to and the IP packet is associated with the destination address. Output to the buffer, and when the predetermined threshold value is exceeded, the packet discriminating unit that outputs the IP packet to the data link frame composing unit and the IP packet output from the packet discriminating unit are input, and the IP packet is input. Refer to the buffer that holds for a certain period of time, the IP packet information storage unit that stores the information including the destination address or the packet size by referring to the header of the IP packet input to the buffer, and the IP packet information storage unit that is the same. Calculate the total size of IP packets with destination address Then, when the total exceeds a predetermined threshold value, the packet size calculation unit for instructing to output the plurality of IP packets held in the buffer to the data link frame configuration unit and the packet determination unit are output. 2. A transmission unit having a data link frame forming unit for forming and outputting a data link frame from the generated IP packet or forming and outputting one data link frame from a plurality of IP packets output from the buffer. The wireless communication device described. 3. The size of a data link frame that enables the most efficient transmission of IP packets is calculated based on past statistical information such as the number of times the data link frame is retransmitted, and the size is calculated by the packet discriminating unit and the packet size calculating unit. The wireless communication device according to claim 2, further comprising a transmission packet size determination unit that sets a threshold value. 4. When an IP packet is received from the network layer, the time since the IP packet was stored in each buffer is measured, and when the predetermined threshold time has elapsed, the IP packet is held in that buffer. 4. The wireless communication device according to claim 2, further comprising a timer for instructing to output all the packets that have been transmitted to the data link frame configuration unit. 5. When an IP packet is received from the network layer, the header of the IP packet is referred to, and when the information contained in the IP packet is immediate data such as a moving image, the threshold time of the timer is shortened. Then
The wireless communication device according to claim 4, wherein the threshold time of the timer is lengthened in the case of asynchronous data. 6. The I included in the data link frame
The data link frame header structure including information indicating the number of P packets and the head position of each IP packet, and a data link frame structure unit forming a data link frame including the data link frame header. Wireless communication device. 7. The data link frame configured by the data link frame construction unit according to claim 6 is input, and information indicating the number of IP packets included in the data link frame header and the head position of each IP packet is provided. A header processing unit that extracts and passes the information to the IP packet extraction unit, an error detection unit that performs error detection by CRC, and a data link frame in which no error is detected by the error detection unit are input, and the header processing unit The wireless communication device according to claim 1, further comprising a receiving unit including an IP packet extracting unit that extracts individual IP packets included in the data link frame based on the information and sequentially transfers the extracted IP packets to the network layer. 8. A data link frame structure for adding an error detection code to each IP packet included in the data link frame, and a data link frame structure section for forming the data link frame. Wireless communication device. 9. An IP packet including an error is determined by determining whether or not an error is included in each IP packet included in the data link frame according to claim 8 by an error detection code. The wireless communication device according to claim 1, wherein in the case of transmitting, a frame requesting the transmitting terminal to retransmit only an IP packet including an error is transmitted.