JP2005252937A - Radio communication apparatus and method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve high-speed transmission performance capable of long-distance and high-definition video communication while obeying radio wave output regulations in the aspects of limited radio resources, frequency bands and security. <P>SOLUTION: A communication processing section 12 includes a TCP/IP section 124 for storing packet data generated by a wired communication section 11 in a first storage section; and a packet scheduler 125 for dividing the packet data stored in the first storage section for the unit of MAC frame data, converting the divided packet data, storing them in a plurality of second storage sections, respectively and transferring the plurality of MAC frame data stored in the plurality of second storage sections, respectively via a bus. Each of radio modules 131, 132 receives the plurality of transferred MAC frame data, respectively as a MAC frame data unit for each radio channel, individually converting the MAC frame data into analog radio signals and sending the plurality of converted analog radio signals, respectively. Each of antennas 141, 142 transmits the plurality of respectively sent analog radio signals, as a radio wave differently polarized for each radio channel, respectively. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a wireless communication apparatus and a wireless communication method for transmitting and receiving signals using a plurality of antennas.

  In recent years, wireless communication technology has attracted attention and continues to develop due to advantages such as low equipment costs, flexibility in network configuration, and low cost in operation of communication. For example, the wireless LAN standard specified by the IEEE 802 Committee (Institute of Electrical and Electronics Engineers 802 Projects) and the IEEE802.11x specification have become international standards, and wireless LAN products that comply with this specification have become widespread throughout the world. ing.

On the other hand, with the advancement of digital processing technology and the full-scale spread of terrestrial digital broadcasting, there are many requests to perform high-definition video communication (SDTV and HDTV classes) using radio. Long-distance and high-speed transmission using wireless technology is strongly desired, but at present, HDTV-class high-speed video transmission (TCP) in the limited radio wave resource, frequency band and safety from the viewpoint of safety / UDP (30 to 40 Mbps or higher) is realized with a wireless LAN, and a high-speed wireless transmission technology for performing long-distance transmission with a system and apparatus suitable for economy has not yet been established.
Several proposals have been made for such needs.

  (1) As one proposal, a wireless transmission technique called MIMO (Multi Input / Multi Output) is being studied by the IEEE 802 committee in the United States. This technique is disclosed in Patent Document 1 or Patent Document 2, and signals are transmitted from a plurality of transmitting antennas to a plurality of receiving antennas using radio waves in the same frequency band, and radio interference (or interference) occurs on the receiving side. This is a method that enables high-speed transmission that is multiple times the transmission speed performance of one transmission / reception opposite (for the number of antennas opposite) by performing removal and delay equalization.

  As specific examples of this MIMO technology, BLAST (Bell Laboratory Layered Space-Time architecture) and space-time coding are known. In BLAST, transmission information is divided and signals are transmitted in parallel from a plurality of antennas at the same frequency, and radio wave interference (or interference) occurs due to the same frequency on the receiving side. An adaptive array is a method for removing this interference. It is characterized by the use of antenna technology. In the space-time coding, the same transmission information is transmitted from a plurality of antennas, but the encoding method is different for each antenna.

  (2) In another method, Patent Document 3 is proposed as a proposal for increasing the transmission rate and improving the frequency utilization efficiency. This proposal comprises a wireless device group having a plurality of transmitters that transmit wireless signals in a distributed manner and a plurality of wireless device groups that can receive the transmitted wireless signals almost simultaneously, and exchanges control signals with each other during transmission and reception. And it is characterized by communicating using MIMO technology.

  (3) In all the examples described so far, a plurality of radio waves in the same frequency band are simultaneously used at the same location to increase the transmission speed and improve the frequency utilization efficiency. In other words, it is intended to realize simultaneous reception of a plurality of signals by advanced signal processing on the transmission side and the reception side. In either case, the processing is complicated, and if the number of simultaneous transmission signals is increased in order to improve transmission performance, it is necessary to increase the number of reception devices, and the system scale and price increase. For this reason, the realization as hardware is scarce, and a big subject remains.

  (4) On the other hand, there are some examples in which high-speed communication is realized using a plurality of channels. For example, Patent Document 4 proposes performing high-speed communication by utilizing a plurality of channels of wireless network communication. Specifically, the first packet signal of the wired network communication is received, it is determined whether or not to divide into a plurality, and if it is determined to be divided, the divided first packet signal is divided into a plurality of first packet signals. Has been proposed to realize high-speed communication by converting the packet into a second packet signal of a plurality of channels for wireless network communication.

  In this method, it is determined to divide depending on the communication speed on the wired side. However, when wireless communication is performed on a plurality of divided second packets for wireless communication on the same device at the same time, a plurality of channels are used. It seems that it is difficult to secure an effective communication band effectively due to radio wave interference between each other. To realize simultaneous wireless communication using multiple channels, measures to reduce radio wave interference as much as possible (for example, MIMO technology) Unless it is done at the same time, it seems difficult to achieve high-speed communication.

  (5) Another example of realizing high-speed communication on the same transmission path or in transmission processing is, for example, NTT's ISDN (Integrated Service Digital Network). In ISDN, when communication is performed in the network layer of Layer 3 (corresponding to the IP layer), packet data having a basic communication speed of 64 Kbps is synchronously transmitted. However, 24 channels of a basic unit of 64 Kbps are connected at the same time. In the upper layer, 64 Kbps packet data is multiplexed into 23 channels (the remaining 1 channel is for control signals) and separated to achieve 1500 Kbps high-speed communication for higher applications (eg, TCP level). ing.

  (6) Although ISDN is wired communication, a method for realizing high-speed communication by connecting a plurality of communication paths and multiplexing and separating higher-layer packet data through a plurality of channels is used in the field of communication. This method is generally called “bulk transmission” and has been proposed for a long time.

(7) On the other hand, another method for communicating using a plurality of radio channels has been proposed. Specifically, two wireless modules that use two IEEE802.11a / g standard wireless LAN processing LSIs that have been standardized by the IEEE 802 Committee and are currently in widespread use are housed in a single housing. By using a wired LAN to interconnect each other, by combining different wireless systems, that is, by combining a wireless LAN module of 11g standard corresponding to the 2.4 GHz band and a wireless LAN module of 11a standard corresponding to the 5 GHz band Products that can communicate independently in dual band have been proposed. This method is suitable as a network relay device such as a bridge and a repeater, but cannot increase the transmission rate.
JP 2000-237751 JP 2002-044051 A JP 2003-332963 A Japanese Patent Laid-Open No. 2004-007186

  When a wireless LAN specified by the IEEE 802 Committee is used to achieve long-distance and high-speed communication, the processing method is complicated by the method using the MIMO technology as shown in the prior art. turn into. In addition, in order to improve communication performance and communication quality by removing radio wave interference, the system scale and price increase, and the realization as hardware is scarce, leaving a big problem.

  The present invention has been made to solve the above-described problems, and has long-distance and high-definition video communication in compliance with limited radio wave resources, frequency bands, and radio wave output regulations from the viewpoint of safety. An object of the present invention is to provide a wireless communication apparatus and a wireless communication method having high-speed transmission performance capable of performing

  A wireless communication apparatus according to the present invention includes a wired communication unit that performs wired communication, a first processing unit that stores packet data generated by the wired communication unit in a first storage unit, and the first storage unit. Is divided into MAC frame data units, converted into a plurality of second storage units and stored separately in the plurality of second storage units, and a plurality of MAC frame data stored separately in the plurality of second storage units A communication processing unit having a second processing means for transferring the data via the bus, and receiving the plurality of MAC frame data transferred from the communication processing unit via the bus as MAC frame data units for each wireless channel. Individually converted into analog radio signals, and separately sent from the plurality of radio modules, a plurality of radio modules for separately sending a plurality of analog radio signals after conversion A plurality of analog radio signal issued as a radio wave having a polarization different for each radio channel, separately, characterized by comprising a plurality of antennas to be transmitted to another wireless communication device.

  The second processing means preferably sends a plurality of MAC frame data separately stored in the plurality of second storage units to the bus at a transmission timing set arbitrarily. . Specifically, it is preferable to control the timing of sending the plurality of MAC frame data to the bus according to the radio wave status notified from the plurality of wireless modules.

  In addition, when the plurality of second storage units is two, the second processing unit alternately transmits two MAC frame data separately stored in the two second storage units to the bus. You may make it send to.

  When the size of the packet data stored in the first storage unit is substantially the same as the size of the MAC frame data, the second processing unit does not divide the packet data, It is preferable that the data is converted into MAC frame data and stored in one of the plurality of second storage units.

  Further, it is preferable that the plurality of radio modules set different transmission frequencies in a range in which the plurality of radio channels do not interfere with each other for the converted plurality of analog radio signals and transmit them separately.

  The wireless communication method according to the present invention is a wireless communication method for performing communication between a first wireless communication device and a second wireless communication device, and on the first wireless communication device side, wired communication is performed. Packet data generated by communication is stored in a first storage unit, and packet data stored in the first storage unit is divided into MAC frame data units and converted into a plurality of second storage units separately. Storing and transferring a plurality of MAC frame data separately stored in the plurality of second storage units via a bus, and transferring the plurality of MAC frame data transferred via the bus to a MAC frame data for each radio channel Separately received as a unit and individually converted into analog radio signals, and the plurality of converted analog radio signals are separately converted into the second radio communication as radio waves having different polarizations for each radio channel. The plurality of analog radio signals received separately from the plurality of analog radio signals transmitted from the first radio communication device on the second radio communication device side Are individually converted into MAC frame data, a plurality of converted MAC claim data are transferred via a bus, and the plurality of MAC claim data transferred via the bus are separately stored in a plurality of third storage units. And combining and converting a plurality of MAC frame data separately stored in the plurality of third storage units into one packet data, storing the combined and converted packet data in a fourth storage unit, Wired communication is performed based on the packet data stored in the fourth storage unit.

  High-speed transmission performance capable of long-distance and high-definition video communication can be realized while complying with limited radio wave resources, frequency bands, and radio wave output regulations from the viewpoint of safety.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a basic configuration of a radio communication system according to an embodiment of the present invention.
As shown in the figure, the wireless communication system includes two wireless communication stations (wireless communication apparatuses) 1 and 2. The wireless communication station 1 and the wireless communication station 2 basically have the same configuration.

  The wireless communication station 1 includes a wired communication unit 11, a communication processing unit 12, a wireless communication unit 13 including n wireless modules (# 1 to #n), and an antenna including n antennas (# 1 to #n). A group 14 is provided. The wired communication unit 11, the communication processing unit 12, and the n wireless modules (# 1 to #n) are connected to a local bus such as a PCI bus. Further, n antennas (# 1 to #n) are connected to n radio modules (# 1 to #n), respectively.

  Similarly, the wireless communication station 2 includes a wired communication unit 21, a communication processing unit 22, a wireless communication unit 23 including n wireless modules (# n + 1 to #m), and n antennas (# n + 1 to #m). An antenna group 24 is provided. The wired communication unit 21, the communication processing unit 22, and the n wireless modules (# n + 1 to #m) are connected to a local bus such as a PCI bus. The n antennas (# n + 1 to #m) are connected to n radio modules (# n + 1 to #m), respectively.

  Between the n antennas (# 1 to #n) on the radio communication station 1 side and the n antennas (# N + 1 to #m) on the radio communication station 2 side, corresponding antennas are connected for each channel. It is configured to perform wireless communication on a one-to-one basis. As a result, n-channel wireless communication can be performed between the wireless communication station 1 and the wireless communication station 2.

Hereinafter, a case where wireless communication using two channels is performed will be described as an example from the viewpoint of easy understanding of the description.
FIG. 2 is a block diagram showing an example of the configuration of the wireless communication station 1 when performing wireless communication using two channels. Elements common to those in FIG. 1 are denoted by the same reference numerals.
The wired communication unit 11 performs wired communication with another wired communication device through, for example, a wired LAN or a public line network.

  The communication processing unit 12 performs mediation between the wired communication unit 11 and the wireless communication unit 13, and includes a communication processing unit 12A as hardware and a communication processing unit 12B as software. The communication processing unit 12A as hardware includes a bus control unit 121 that performs interface processing with a local bus, a memory 122 that stores various programs, and a CPU 123 that controls the operation of the entire communication processing unit. The communication processing unit 12B as software operates under the control of the CPU 123, a TCP / IP unit 124 that performs packet processing based on TCP / IP, a packet scheduler 125 that performs packet protocol conversion processing, and the like, and a wireless module A device driver 126 that controls the device is included.

The wireless communication unit 13 includes two wireless modules 131 and 132 (such as a wireless LAN card) conforming to IEEE802.11a, IEEE802.11b, IEEE802.11g, etc. (hereinafter collectively referred to as IEEE802.11x) related to the wireless LAN. Including. The wireless module 131 performs a bus control unit 1311 that performs an interface process with a local bus, a MAC unit 1312 that performs a process related to a MAC (Media Access Control) frame, a BBP unit 1313 that performs a process related to a baseband, and a process related to a radio frequency. An RF unit 1314 is included. Similarly, the wireless module 132 includes a bus control unit 1321 that performs interface processing with a local bus, a MAC unit 1322 that performs processing related to a MAC frame, a BBP unit 1323 that performs processing related to a baseband, and an RF unit that performs processing related to a radio frequency. 1324.
The antenna group 14 includes an antenna 141 connected to the RF unit 1314 and an antenna 142 connected to the RF unit 1324.

  FIG. 3 is a block diagram showing the configuration of various communication protocol stacks when wired communication is performed between the wireless communication station 1 and the image codec apparatus.

  In the example shown in the figure, a video camera 3 is connected to an image codec device 4, and the image codec device 4 is connected to a wired communication unit 11 in the wireless communication station 1 via a wired LAN.

  The image codec device 4 includes a codec unit 41, a TCP / IP layer 42, a device driver 43, a MAC layer 44, and a physical (PHY) layer 45.

  The wired communication unit 11 in the wireless communication station 1 includes a wired module 111 and a communication processing unit 112 as software. In this case, the wired module 111 includes a MAC layer 1111 and a physical (PHY) layer 1112. The communication processing unit 112 includes a TCP / IP layer 1121 and a device driver 1122.

  The wireless communication unit 13 in the wireless communication station 1 includes the wireless module 131 and the wireless module 132 as described above. The wireless module 131 includes a MAC layer 1312 and an RF layer 1314. Similarly, the wireless module 132 includes a MAC layer 1322 and an RF layer 1324.

  As described above, various protocol stacks include a physical layer that performs physical signal transmission / reception processing, a MAC layer that performs MAC frame processing, a device driver that controls devices, and a TCP / IP that performs processing such as IP packets. Layers are provided, and data transmission / reception between devices is realized through these various layers. For example, an image captured from the video camera 3 to the image codec device 4 is transmitted as a video data stream to the wired communication unit 11 and then stored as an IP packet in the TCP / IP layer 124 in the communication processing unit 12B. After being divided and converted into MAC frame data units by the scheduler 125, individually transferred to the wireless modules 131 and 132 in the wireless communication unit 13 via the device driver 126, converted into analog wireless signals, and then the antenna 141. , 142 are transmitted as radio waves to other wireless communication stations.

  FIG. 4 is a conceptual diagram showing an example of the relationship between the data formats of various protocols. In the same figure, the frame structure of the MAC layer compliant with IEEE 802.11x, the packet structure of the IP layer which is a protocol higher than that, and the video data stream structure as an example of the application are shown, and the corresponding relationship is illustrated. ing.

  FIG. 5 is a conceptual diagram showing another example of the relationship between the data formats of various protocols. In the example of the figure, the same relationship as described above is shown in detail, but in particular, the TCP / IP packet and the MAC frame have a one-to-one relationship.

  FIG. 6 is a diagram showing in detail a characteristic part in the communication processing unit 12B as software. As described above, the communication processing unit 12B includes the TCP / IP unit 124, the packet scheduler 125, and the device driver 126. Note that the internal configuration of the communication processing unit 22B is the same as the internal configuration of the communication processing unit 12B, and is omitted in FIG.

  The packet data generated as a result of the wired communication performed by the wired communication unit 11 is sent to the communication processing unit 12B as software. The TCP / IP unit 124 stores the packet data as IP packet data in the transmission queue 124A.

  The packet scheduler 125 divides and converts the IP packet data stored in the transmission queue 124A into MAC frame data units according to the correspondence shown in FIG. 4, for example, and stores them separately in the plurality of transmission queues 125A and 125B. A plurality of MAC frame data separately stored in the plurality of transmission queues are individually transferred to the wireless modules 131 and 132 via the local bus through the device driver 126.

  There are several methods for timing control in which the packet scheduler 125 transmits a plurality of MAC frame data separately stored in the plurality of transmission queues 125A and 125B to the local bus as follows.

(1) A method of sending the MAC frame data to the bus according to the radio wave condition of the wireless communication section notified for each received data unit from the plurality of wireless modules 131 and 132. (2) At an arbitrarily set sending timing. (3) Method of alternately transmitting the MAC frame data to the bus Note that the size of the IP packet data stored in the transmission queue 124A is substantially equal to the size of the MAC frame data. If they are the same, the packet scheduler 125 performs conversion to MAC frame data according to the correspondence shown in FIG. 5 without dividing the packet data, and one of the transmission queues 125A and 125B. (For example, store alternately).

  The plurality of wireless modules 131 and 132 separately receive a plurality of MAC frame data transferred from the packet scheduler 125 via the bus as a MAC frame data unit for each wireless channel, and individually convert them into analog wireless signals. A plurality of later analog radio signals are separately transmitted to the antennas 141 and 142.

  The plurality of antennas 141 and 142 separately transmit a plurality of analog wireless signals transmitted separately from the plurality of wireless modules 131 and 132 to another wireless communication device (corresponding to the wireless communication station 2 described above). In the illustrated example, a plurality of analog radio signals transmitted separately from a plurality of antennas 141 and 142 are received by a plurality of antennas 241 and 242 and converted into MAC frame data by a plurality of radio modules 231 and 232, respectively. Thereafter, the data is taken into the communication processing unit 22B.

  The wireless modules 131 and 132 may conform to the same wireless LAN standard, or may conform to different wireless LAN standards. When two wireless modules conform to the same wireless LAN standard (for example, both conform to IEEE802.11a, or both conform to IEEE802.11g), (1 It is preferable that the plurality of radio modules 141 and 142 set different transmission frequencies within a range in which the plurality of radio channels do not interfere with each other for the converted plurality of analog radio signals and transmit them separately. Further, (2) the plurality of antennas 141 and 142 separately transmit a plurality of analog radio signals transmitted separately from the plurality of radio modules 141 and 142 as radio waves having different polarizations for each radio channel. It is desirable that If both (1) and (2) are adopted, the effect of reducing the influence of radio wave interference is great. However, adopting either (1) or (2) is also effective.

For example, as shown in FIG. 7, in order to avoid the influence of radio wave interference as much as possible, it is possible to transmit using two channels whose frequency bands are farthest from each other.
Further, as shown in FIGS. 8A and 8B, it may be transmitted by combining horizontal polarization and vertical polarization. Note that it is not always necessary to use a combination of polarizations that form 90 degrees, and a combination of polarizations that forms a different angle (for example, 45 degrees) can be used as long as the effect of avoiding the influence of radio wave interference is achieved. May be. A combination of different types of circularly polarized waves (for example, counterclockwise circularly polarized wave and clockwise circularly polarized wave) may be employed.

  On the other hand, when a plurality of analog wireless signals are transmitted from a plurality of antennas 241 and 242 on the other wireless communication apparatus (corresponding to the above-described wireless communication station 2), the plurality of antennas 141 and 142 are connected to the plurality of analog wireless signals. Receive radio signals separately.

  Here, the plurality of wireless modules 131 and 132 detect radio wave conditions in the wireless communication section for each wireless channel from a plurality of analog wireless signals received separately by the plurality of antennas 141 and 142, and packetize them. Notify the scheduler 125. Note that the detection of the radio wave condition can be realized by mounting a chip or the like for measuring a change in reception sensitivity or radio wave intensity on the wireless modules 131 and 132, for example.

  The plurality of wireless modules 131 and 131 individually convert a plurality of analog wireless signals received separately by the plurality of antennas 141 and 142 into MAC frame data, and convert the plurality of converted MAC claim data to a local bus. Then, the packet is transferred to the packet scheduler 125.

  The packet scheduler 125 separately stores a plurality of MAC claim data transferred from a plurality of wireless modules 131 and 132 via a local bus in a plurality of reception queues 125C and 125D, and separately stores them in the plurality of reception queues. The plurality of MAC frame data is combined into one IP packet data, converted (multiplexed), and sent to the TCP / IP unit 124.

  The TCP / IP unit 124 stores the IP packet data synthesized and converted by the packet scheduler 125 in the reception queue 124B. Thereby, the above-described wired communication unit 11 performs wired communication based on the packet data.

  Note that although an example in which wireless communication is performed using two channels is given here, of course, wireless communication can be performed using three or more channels. In that case, as many transmission queues in the packet scheduler 125 as the number of channels are provided (the same applies to the reception queue).

  Further, for example, when the radio wave intensity of a signal corresponding to a certain channel is reduced, in order to suppress the reduction in communication performance and communication quality as much as possible, based on the information on the radio wave conditions obtained from the plurality of wireless modules 131 and 132. As described above, the MAC frame data is controlled to be sent from the plurality of transmission queues in the packet scheduler 125 to the local bus at the transmission timing arbitrarily set as described above, or the plurality of transmission queues in the packet scheduler 125 are controlled. Of these, it is effective to perform control such as reducing the frequency of using the transmission queue corresponding to the channel in which the problem occurred and increasing the frequency of using the remaining transmission queue (that is, changing the distribution ratio to each transmission queue). It is. This is true not only when two channels are used, but also when three or more channels are used.

  Next, an example of an operation when data is transmitted from the wireless communication station 1 to the wireless communication station 2 will be described with reference to the flowchart of FIG. Note that the configuration block diagrams of FIGS. 2 and 6 are also referred to as appropriate.

  The wired communication unit 11 performs wired communication through a LAN or a public line network (step A1), and the TCP / IP unit 124 acquires the packet data generated thereby and stores it in the transmission queue 124A (step A2).

  The packet scheduler 125 divides and converts into a plurality of MAC frame units conforming to the IEEE 802.11x standard, and stores them separately in the plurality of transmission queues 125A and 125B (step A3).

  The packet scheduler 125 transmits a plurality of MAC frame data stored separately from the communication processing unit 12 to the local bus while controlling the transmission timing according to the radio wave condition in the wireless communication section notified for each reception unit, for example. Then, the data is transferred to the wireless communication unit 13 (step A4).

  The plurality of wireless modules 131 and 132 separately receive a plurality of MAC complaint data transferred via the local bus as a unit of MAC frame data for each wireless channel, and individually convert them into analog wireless signals (step A5). .

  The plurality of wireless modules 131 and 132 set different transmission frequencies in a range in which the plurality of wireless channels do not interfere with each other for the converted plurality of analog wireless signals, and separately to the plurality of antennas 141 and 142 via a wired cable. Send (step A6).

  The plurality of antennas 141 and 142 transmit a plurality of analog radio signals set with different transmission frequencies within a range in which the plurality of radio channels do not interfere with each other as radio waves having different polarizations for each radio channel (step A7).

  Next, an example of an operation when the wireless communication station 1 receives data from the wireless communication station 2 will be described with reference to a flowchart of FIG. Note that the configuration block diagrams of FIGS. 2 and 6 are also referred to as appropriate.

  The plurality of antennas 141 and 142 separately receive a plurality of analog radio signals transmitted as radio waves having different transmission frequencies within a range in which a plurality of radio channels do not interfere with each other and having different polarizations for each radio channel. Then, the data is sent to the plurality of wireless modules 131 and 132 (step B1).

  The plurality of wireless modules 131 and 132 detect the radio wave condition in the wireless communication section for each wireless channel from the plurality of analog wireless signals separately received by the plurality of antennas 141 and 142, and notify the communication processing unit 12 (Step B2).

  The plurality of radio modules 131 and 132 individually convert a plurality of analog radio signals received separately by the plurality of antennas 141 and 142 into MAC frame data (step B3).

  Further, the plurality of wireless modules 131 and 132 transfer the converted plurality of MAC frame data from the wireless communication unit 13 to the communication processing unit 12 via the local bus (step B4).

  The packet scheduler 125 separately stores the plurality of MAC frame data transferred via the local bus in the plurality of reception queues 125C and 125D (step B5).

  Further, the packet scheduler 125 combines and converts (multiplexes) a plurality of separately stored MAC frame data into one IP packet data and stores it in the reception queue 124B of the TCP / IP unit 124 (step B6).

  The communication processing unit 12 sends the packet data stored in the reception queue 124B of the TCP / IP unit 124 to the wired communication unit 11, and performs wired communication through a LAN, a public line network, or the like (step B7).

  As described above, according to the present embodiment, the wireless LAN technology specified by the IEEE 802 Committee is used, and the radio wave output regulations from the viewpoint of limited radio resource, frequency band and safety are observed. High-speed transmission performance capable of long-distance and high-definition video communication can be realized, and various conventional problems can be solved.

  The present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

1 is a block diagram showing a basic configuration of a wireless communication system according to an embodiment of the present invention. The block diagram which shows an example of a structure of the radio | wireless communication station 1 in the case of performing radio | wireless communication by 2 channels. FIG. 3 is a block diagram showing the configuration of various communication protocol stacks when wired communication is performed between the wireless communication station 1 and the image codec device 4. The conceptual diagram which shows an example of the relationship of the data format of various protocols. The conceptual diagram which shows another example of the relationship of the data format of various protocols. The figure which shows the characteristic part in the communication processing part 12B as software in detail. The figure for demonstrating transmitting using two channels which frequency bands are the most distant from each other in order to avoid the influence of radio wave interference as much as possible. The figure for demonstrating transmitting combining a horizontal polarization and a vertical polarization. 6 is a flowchart illustrating an example of an operation when data is transmitted from the wireless communication station 1 to the wireless communication station 2; 5 is a flowchart showing an example of an operation when the wireless communication station 1 receives data from the wireless communication station 2;

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,2 ... Wireless communication station, 11, 21 ... Wired communication part, 12, 22 ... Communication processing part, 13, 23 ... Wireless communication part, 14, 24 ... Antenna group, 122 ... Memory, 123 ... CPU, 124 ... TCP / IP unit, 125 ... packet scheduler, 126 ... device driver, 131, 132 ... wireless module, 141, 142 ... antenna.

Claims (10)

A wired communication unit for performing wired communication;
A first processing means for storing packet data generated by the wired communication unit in a first storage unit, and a plurality of packet data stored in the first storage unit by dividing and converting into MAC frame data units A second processing unit that stores the MAC frame data separately stored in the second storage unit and the plurality of MAC frame data separately stored in the plurality of second storage units via a bus; ,
The plurality of MAC frame data transferred via the bus from the communication processing unit is separately received as a MAC frame data unit for each radio channel and individually converted into an analog radio signal, and the converted plurality of analog radio signals A plurality of wireless modules that transmit separately,
A plurality of antennas for separately transmitting a plurality of analog wireless signals transmitted from the plurality of wireless modules as radio waves having different polarizations for each wireless channel to other wireless communication devices; A wireless communication device. The plurality of antennas further separately receives a plurality of analog radio signals transmitted from other radio communication devices,
The plurality of radio modules further convert the plurality of analog radio signals received separately by the plurality of antennas into MAC frame data and transfer the plurality of converted MAC claim data via a bus. ,
The second processing means further stores the plurality of MAC claim data transferred from the plurality of wireless modules via a bus separately in a plurality of third storage units, and the plurality of third processing units. A plurality of MAC frame data separately stored in the storage unit is combined into one packet data, converted and sent to the first processing means,
The first processing means further stores the packet data synthesized and converted by the second processing means in a fourth storage unit,
The wireless communication apparatus according to claim 1, wherein the wired communication unit further performs wired communication based on the packet data stored in the fourth storage unit. The plurality of wireless modules detect a radio wave condition in a wireless communication section for each wireless channel from the plurality of analog wireless signals separately received by the plurality of antennas, and notify the communication processing unit,
The said 2nd process means controls the timing which sends out these MAC frame data to a bus | bath according to the said electromagnetic wave condition notified from these radio | wireless modules. Wireless communication device.   2. The second processing means sends out a plurality of MAC frame data separately stored in the plurality of second storage units to a bus at an arbitrarily set sending timing. Or the radio | wireless communication apparatus of 2. The plurality of second storage units is two,
3. The radio according to claim 1, wherein the second processing unit alternately sends two MAC frame data separately stored in the two second storage units to a bus. 4. Communication device.   When the size of the packet data stored in the first storage unit is substantially the same as the size of the MAC frame data, the second processing means does not divide the packet data, and the MAC frame The wireless communication apparatus according to claim 1, wherein the wireless communication apparatus is converted into data and stored in one of the plurality of second storage units.   3. The plurality of radio modules set different transmission frequencies in a range in which a plurality of radio channels do not interfere with each other for the plurality of analog radio signals after conversion, and transmit the analog radio signals separately. A wireless communication device according to 1.   The wireless communication apparatus according to claim 1, wherein the plurality of wireless modules are two wireless modules conforming to the same wireless LAN standard.   The wireless communication apparatus according to claim 1, wherein the plurality of wireless modules are two wireless modules conforming to different wireless LAN standards. A wireless communication method for performing communication between a first wireless communication device and a second wireless communication device,
On the first wireless communication device side,
Storing packet data generated by wired communication in the first storage unit;
The packet data stored in the first storage unit is divided into MAC frame data units, converted and separately stored in a plurality of second storage units,
Transferring a plurality of MAC frame data separately stored in the plurality of second storage units via a bus;
The plurality of MAC frame data transferred via the bus is separately received as a MAC frame data unit for each radio channel and individually converted into an analog radio signal,
A plurality of analog wireless signals after conversion are separately transmitted to the second wireless communication device as radio waves having different polarizations for each wireless channel,
On the second wireless communication device side,
Separately receiving a plurality of analog wireless signals transmitted from the first wireless communication device;
Converting the plurality of analog radio signals received separately into MAC frame data;
Transfer multiple converted MAC claim data via the bus,
Separately storing the plurality of MAC claim data transferred via a bus in a plurality of third storage units;
Combining and converting a plurality of MAC frame data separately stored in the plurality of third storage units into one packet data;
The synthesized and converted packet data is stored in a fourth storage unit,
A wireless communication method, wherein wired communication is performed based on the packet data stored in the fourth storage unit.

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