WO2014174801A1 - 無線通信装置、無線通信システム及び無線通信方法 - Google Patents
無線通信装置、無線通信システム及び無線通信方法 Download PDFInfo
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- WO2014174801A1 WO2014174801A1 PCT/JP2014/002147 JP2014002147W WO2014174801A1 WO 2014174801 A1 WO2014174801 A1 WO 2014174801A1 JP 2014002147 W JP2014002147 W JP 2014002147W WO 2014174801 A1 WO2014174801 A1 WO 2014174801A1
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- wireless
- transmission capacity
- wireless communication
- fragments
- size
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/08—Load balancing or load distribution
- H04W28/082—Load balancing or load distribution among bearers or channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/14—Channel dividing arrangements, i.e. in which a single bit stream is divided between several baseband channels and reassembled at the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/36—Flow control; Congestion control by determining packet size, e.g. maximum transfer unit [MTU]
- H04L47/365—Dynamic adaptation of the packet size
Definitions
- the present invention relates to a wireless communication device, a wireless communication system, and a wireless communication method, and more particularly, to a wireless communication device, a wireless communication system, and a wireless communication method capable of transmitting data via a plurality of wireless lines.
- a network using a wireless line has a small capacity that can be transmitted by only one wireless line. Therefore, there are cases where a plurality of wireless lines are bundled to ensure a transmission capacity virtually as one line. In other words, a single traffic is distributed over a plurality of wireless lines, thereby ensuring a transmission capacity for the entire wireless line.
- This bundling of a plurality of wireless lines is called link aggregation. This link aggregation is defined by IEEE 802.3ad.
- Patent Document 1 can be realized using a single carrier wave by modulating and transmitting three data streams using carrier waves of three different frequencies. It is disclosed that a data rate faster than the data rate can be obtained.
- a fragment is formed when a single data stream is divided into multiple data streams.
- the fragment size is not set in consideration of the transmission capacity of a plurality of wireless lines. Therefore, when data is transmitted through a plurality of wireless lines, there is a possibility that the difference in transmission delay between the wireless lines becomes large.
- An object of the present invention is to solve such problems, and a wireless communication device, a wireless communication system, and a wireless communication capable of suppressing a difference in transmission delay between a plurality of wireless channels It is to provide a method.
- a wireless communication apparatus includes a transmission unit that transmits radio waves via a plurality of wireless lines, and a plurality of fragments by dividing data into a size corresponding to a transmission capacity of each of the plurality of wireless lines.
- Dividing means for generating, and the transmitting means transmits each of the plurality of fragments to another wireless communication apparatus via a wireless line having a transmission capacity corresponding to the size of the fragment. .
- a radio communication system includes a first radio communication device that transmits radio waves via a plurality of radio channels, and a second radio communication device that receives the radio waves via the plurality of radio channels. Then, the first wireless communication device includes a dividing unit that generates data by dividing data by a size corresponding to a transmission capacity of each of the plurality of wireless lines and each of the plurality of fragments. Transmitting means for transmitting to the second wireless communication device via a wireless line having a transmission capacity corresponding to the size of the fragment, wherein the second wireless communication device includes the plurality of wireless devices. Receiving means for receiving the plurality of fragments via each line; and restoration means for combining the plurality of fragments to restore the original data.
- the wireless communication method generates a plurality of fragments by dividing data by a size corresponding to the transmission capacity of each of a plurality of wireless lines, and each of the plurality of fragments corresponds to the size of the fragment.
- the data is transmitted to another wireless communication device via a wireless line having a transmission capacity of the size.
- a wireless communication device capable of suppressing the occurrence of transmission delay differences in a plurality of wireless lines.
- FIG. 1 is a diagram showing a wireless communication system according to a first exemplary embodiment.
- 1 is a diagram showing a configuration of a wireless communication apparatus according to a first exemplary embodiment.
- FIG. 3 is a diagram illustrating a modulation scheme correspondence table stored in the control unit according to the first embodiment.
- 4 is a flowchart showing an operation in the wireless communication device on the transmission side according to the first exemplary embodiment.
- 4 is a flowchart showing an operation in the wireless communication device on the transmission side according to the first exemplary embodiment.
- 3 is a diagram illustrating a data flow in the wireless communication device on the transmission side according to the first exemplary embodiment;
- FIG. 1 is a diagram showing a wireless communication system according to a first exemplary embodiment.
- 1 is a diagram showing a configuration of a wireless communication apparatus according to a first exemplary embodiment.
- FIG. 3 is a diagram illustrating a modulation scheme correspondence table stored in the control unit according to the first embodiment.
- 4 is a flowchart showing
- FIG. 4 is a flowchart showing an operation in the radio communication device on the receiving side according to the first exemplary embodiment.
- FIG. 3 is a diagram illustrating a data flow in the receiving-side wireless communication device according to the first exemplary embodiment; 6 is a flowchart illustrating an operation in a wireless communication device on a transmission side according to a second exemplary embodiment.
- FIG. 6 is a diagram illustrating a data flow in a transmitting-side wireless communication apparatus according to a second embodiment;
- FIG. 6 is a diagram illustrating a data flow in a transmitting-side wireless communication apparatus according to a second embodiment;
- 10 is a flowchart illustrating an operation in a radio communication device on a transmission side according to a third exemplary embodiment.
- FIG. 10 is a diagram illustrating a data flow in the transmitting-side wireless communication apparatus according to the third embodiment;
- FIG. 10 is a diagram illustrating a data flow in the transmitting-side wireless communication apparatus according to the third embodiment;
- FIG. 1 is a diagram showing an outline of a wireless communication device 1 according to an embodiment of the present invention.
- the wireless communication device 1 includes a dividing unit 12 and a transmitting unit 14.
- the transmission means 14 transmits radio waves via a plurality of wireless lines.
- the dividing unit 12 generates a plurality of fragments by dividing the data by a size corresponding to the size of the transmission capacity of each of the plurality of wireless lines.
- the transmission unit 14 transmits each of the plurality of fragments to another wireless communication device via a wireless line having a transmission capacity corresponding to the size of the fragment. According to the wireless communication device 1 according to the embodiment of the present invention, it is possible to suppress a difference in transmission delay between a plurality of wireless lines.
- FIG. 2 is a diagram of the wireless communication system 50 according to the first embodiment.
- the wireless communication system 50 includes a wireless communication device A100A (first wireless communication device) and a wireless communication device B100B (second wireless communication device).
- the wireless communication device A 100A and the wireless communication device B 100B are connected so as to be capable of wireless communication via three wireless lines # 1 to # 3 (first wireless line and second wireless line).
- the wireless communication device A 100A and the wireless communication device B 100B are connected to the data lines 60A and 60B, respectively.
- the data lines 60A and 60B are lines connected to a network such as a communication carrier or a provider carrier.
- the wireless communication device A 100A and the wireless communication device B 100B transmit and receive user data such as packets or frames via the data lines 60A and 60B.
- the wireless communication system 50 may conform to, for example, Ethernet (registered trademark).
- the wireless communication device A100A has three antennas 102A-1 to 102A-3.
- the antenna 102A-1 transmits and receives radio waves via the wireless line # 1.
- the antenna 102A-2 transmits and receives radio waves via the wireless line # 2.
- the antenna 102A-3 transmits and receives radio waves via the wireless line # 3.
- the wireless communication device B100B has three antennas 102B-1 to 102B-3.
- the antenna 102B-1 transmits and receives radio waves via the wireless line # 1.
- the antenna 102B-2 transmits and receives radio waves via the wireless line # 2.
- the antenna 102B-3 transmits and receives radio waves via the wireless line # 3.
- the wireless communication device A 100A and the wireless communication device B 100B perform wireless communication by bonding three wireless lines # 1 to # 3 to one traffic.
- the wireless communication device A 100A and the wireless communication device B 100B perform link aggregation for the three wireless lines # 1 to # 4.
- the wireless communication device A 100A and the wireless communication device B 100B ensure a transmission capacity. That is, even if the transmission capacity of each wireless line is small, a transmission capacity corresponding to the total transmission capacity of these wireless lines can be secured by bundling a plurality of these wireless lines by link aggregation.
- the wireless communication device A100A receives a packet (user data) via a data line and divides the packet into a plurality of fragments. At this time, the wireless communication device A 100A divides the data by a size corresponding to the size of the transmission capacity of each of the wireless lines # 1 to # 3 to thereby generate a plurality of fragments (first fragment, second fragment). ) Is generated. Then, the wireless communication device A100A transmits the generated plurality of fragments to the wireless communication device B100B via the wireless lines # 1 to # 3 having transmission capacities corresponding to the respective sizes. .
- wireless communication apparatus B 100B When wireless communication apparatus B 100B receives a plurality of fragments from wireless communication apparatus A 100A via wireless lines # 1 to # 3, the wireless communication apparatus B 100B combines the plurality of fragments to generate (restore) the original packet. To do. Details will be described later.
- the wireless communication device A 100A and the wireless communication device B 100B are collectively referred to as the wireless communication device 100.
- a plurality of components such as the antennas 102A-1 to 102A-3 will be collectively referred to as the antenna 102A when they are described without being distinguished.
- antennas 102-1 to 102-3 when not distinguishing between the components of the wireless communication device A 100A and the wireless communication device B 100B, they may be collectively referred to as antennas 102-1 to 102-3.
- it may generically call the antenna 102 grade
- FIG. 3 is a diagram illustrating a configuration of the wireless communication device 100.
- the wireless communication apparatus 100 includes a dividing circuit 120 (dividing means), wireless transmission / reception processing circuits 140-1 to 140-3 (transmitting means, receiving means), a restoring circuit 160 (restoring means), and a control unit 200. Is done.
- the wireless transmission / reception processing circuits 140-1 to 140-3 are associated with the wireless lines # 1 to # 3, respectively. That is, the radio transmission / reception processing circuit 140-1 is connected to the antenna 102-1.
- the radio transmission / reception processing circuit 140-2 is connected to the antenna 102-2.
- the wireless transmission / reception processing circuit 140-3 is connected to the antenna 102-3.
- the dividing circuit 120 is electrically connected to the radio transmission / reception processing circuits 140-1 to 140-3, respectively. Further, the dividing circuit 120 is electrically connected to the data line 60.
- the restoration circuit 160 is electrically connected to the radio transmission / reception processing circuits 140-1 to 140-3, respectively. Further, the restoration circuit 160 is electrically connected to the data line 60.
- the division circuit 120 and the restoration circuit 160 are described as separate circuits. However, the division circuit 120 and the restoration circuit 160 may not be separate and have the same circuit configuration. Also good. In other words, the functions of the dividing circuit 120 and the restoration circuit 160 may be realized by a single circuit.
- the dividing circuit 120 receives a packet via the data line 60 and divides the packet to generate a fragment. At this time, the dividing circuit 120 generates a plurality of fragments by dividing the data by a size corresponding to the size of the transmission capacity of each of the wireless lines # 1 to # 3. Further, the dividing circuit 120 converts the fragments having the sizes corresponding to the transmission capacities of the wireless lines # 1 to # 3 into the wireless transmission / reception processing circuits 140-1 to 140-1 corresponding to the wireless lines # 1 to # 3, respectively. 140-3 is transmitted. Details will be described later.
- the restoration circuit 160 receives a plurality of fragments transmitted from the radio transmission / reception processing circuits 140-1 to 140-3 via the corresponding radio lines # 1 to # 3. Further, the restoration circuit 160 combines the plurality of fragments, restores the original packet, and transmits it to the data line 60. Details will be described later.
- the wireless transmission / reception processing circuits 140-1 to 140-3 have a function as a modem. Specifically, the radio transmission / reception processing circuit 140-1 transmits / receives radio waves via the antenna 102-1 and the radio line # 1, and performs modulation / demodulation processing, amplification processing, and the like.
- the radio transmission / reception processing circuit 140-2 transmits / receives radio waves via the antenna 102-2 and the radio line # 2, and performs modulation / demodulation processing, amplification processing, and the like.
- the wireless transmission / reception processing circuit 140-3 transmits / receives radio waves via the antenna 102-3 and the wireless line # 3, and performs modulation / demodulation processing, amplification processing, and the like.
- the radio transmission / reception processing circuit 140-1 monitors the radio wave condition in the radio line # 1, performs adaptive modulation processing according to the radio wave condition, and changes the modulation method as appropriate. For example, when the radio transmission / reception processing circuit 140-1 supports AMR (Adaptive Modulation / Radio) control, the radio transmission / reception processing circuit 140-1 changes the radio channel status due to weather fluctuations, that is, the quality of the radio channel. When the signal quality deteriorates, the modulation method is changed accordingly, and the radio band is changed. For example, when 16QAM, 64QAM, 256QAM, or the like is used as the modulation scheme (multi-level modulation scheme), one modulation scheme may be selected and used from these modulation schemes depending on the radio channel status.
- AMR Adaptive Modulation / Radio
- the wireless transmission / reception processing circuits 140-2 and 140-3 perform the adaptive modulation processing as described above for the wireless line # 2 and the wireless line # 3 in the same manner as the wireless transmission / reception processing circuit 140-1. Further, the above-described AMR control can be performed between the wireless transmission / reception processing circuit 140 of the transmission-side wireless communication device A100A and the wireless transmission / reception processing circuit 140 of the reception-side wireless communication device B100B.
- the radio transmission / reception processing circuits 140-1 to 140-3 transmit information indicating the current modulation scheme (modulation scheme information) to the control unit 200.
- the radio transmission / reception processing circuit 140 may transmit the modulation method information to the control unit 200 every time the modulation method is changed, or may transmit the modulation method information to the control unit 200 when requested by the control unit 200. Also good. Details will be described later.
- the control unit 200 may be configured as a computer having, for example, a CPU (Central Processing Unit) and a memory, and the function can be realized by executing software (program).
- the control unit 200 controls the division circuit 120 by transmitting and receiving information to and from the division circuit 120 via the division circuit control bus 112.
- the control unit 200 controls the wireless transmission / reception processing circuits 140-1 to 140-3 by transmitting / receiving information to / from the wireless transmission / reception processing circuits 140-1 to 140-3 via the modem control bus 114. To do.
- the control unit 200 controls the restoration circuit 160 by transmitting / receiving information to / from the restoration circuit 160 via the restoration circuit control bus 116.
- control unit 200 receives an alarm from the restoration circuit 160 when the restoration circuit 160 cannot restore the original packet due to some failure.
- the control unit 200 requests the transmission-side wireless communication apparatus A 100A again for a packet, or performs necessary processing such as notifying the user in response to the alarm.
- control unit 200 stores a modulation scheme correspondence table illustrated in FIG. As illustrated in FIG. 4, each of the radio lines # 1 to # 3 is associated in advance with which modulation system and how much the transmission capacity is.
- the transmission capacity of the wireless line is, for example, the bandwidth of the wireless line, and is the amount of data per unit time (unit: Mbps (bit per second)) that can be transmitted via the wireless line.
- the transmission capacity of the wireless line # 1 is the transmission capacity # 1A. Further, if the modulation method is modulation method B in the wireless line # 1, the transmission capacity of the wireless line # 1 is the transmission capacity # 1B. Further, if the modulation method is modulation method C in the wireless line # 1, the transmission capacity of the wireless line # 1 is the transmission capacity # 1C.
- the transmission capacity # 1A and the like indicate specific transmission capacity values (for example, 100 Mbps).
- the transmission capacity of the wireless line # 2 is the transmission capacity # 2A.
- the transmission capacity of the wireless line # 2 is the transmission capacity # 2B.
- the modulation method is modulation method C in the wireless line # 2
- the transmission capacity of the wireless line # 2 is the transmission capacity # 2C.
- the transmission capacity of the wireless line # 3 is the transmission capacity # 3A.
- the transmission capacity of the wireless line # 3 is the transmission capacity # 3B.
- the modulation method is modulation method C in the wireless line # 3
- the transmission capacity of the wireless line # 3 is the transmission capacity # 3C.
- the control unit 200 refers to the modulation scheme correspondence table and uses the modulation scheme information from the radio transmission / reception processing circuit 140 to acquire the transmission capacities of the radio channels # 1 to # 3.
- the contents of this modulation scheme correspondence table can be changed as appropriate. Specific processing contents will be described later.
- the modulation schemes to which the radio channels # 1 to # 3 can be applied are the modulation schemes A to C, and the same three types of modulation schemes can be applied respectively.
- the modulation schemes to which the radio lines # 1 to # 3 can be applied may be different for each radio line.
- the modulation scheme applicable to the radio channel # 1 may be modulation scheme A and modulation scheme B
- the modulation scheme applicable to the radio channel # 2 may be modulation scheme B and modulation scheme C. Good.
- FIG. 5 and FIG. 6 are flowcharts showing operations in the transmitting-side radio communication apparatus 100 (radio communication apparatus A 100A).
- FIG. 7 is a diagram illustrating a flow of data (packets and fragments) in radio communication apparatus 100 (radio communication apparatus A 100A) on the transmission side.
- FIG. 8 is a flowchart showing an operation in the radio communication device 100 (radio communication device B100B) on the receiving side.
- FIG. 9 is a diagram illustrating a data flow in radio communication apparatus 100 (radio communication apparatus B 100B) on the receiving side. 7 and 9, the components of the wireless communication device 100 are omitted as appropriate.
- the wireless communication device A100A receives the packet via the data line 60 (S102). Specifically, the dividing circuit 120 receives the packet # 1 as shown in FIG.
- control unit 200 of the wireless communication apparatus A100A sets the transmission capacity of each wireless line (S20).
- the specific process of S20 is shown in FIG.
- the control unit 200 receives modulation scheme information on each radio channel from the radio transmission / reception processing circuits 140-1 to 140-3 (S202).
- the control unit 200 refers to the modulation scheme correspondence table illustrated in FIG. 4 and converts the modulation scheme information regarding each of the radio lines # 1 to # 3 into a transmission capacity (S204). For example, when the modulation scheme information from the radio transmission / reception processing circuit 140-1 indicates the modulation scheme A (for example, “16QAM”), the control unit 200 refers to the modulation scheme correspondence table and refers to the modulation scheme information on the radio line # 1. Is converted to transmission capacity # 1A (50 Mbps in the example of FIG. 7).
- the control unit 200 when the modulation scheme information from the radio transmission / reception processing circuit 140-2 indicates the modulation scheme B (for example, “64QAM”), the control unit 200 refers to the modulation scheme correspondence table and modulates the radio channel # 2.
- the system information is converted into transmission capacity # 2B (100 Mbps in the example of FIG. 7).
- the modulation scheme information from the radio transmission / reception processing circuit 140-3 indicates the modulation scheme C (for example, “256QAM”)
- the control unit 200 refers to the modulation scheme correspondence table, and modulates the radio channel # 3.
- the system information is converted into transmission capacity # 3C (150 Mbps in the example of FIG. 7).
- the control unit 200 sets the transmission capacity of the radio lines # 1 to # 3 in the dividing circuit 120 (S206). Specifically, the control unit 200 transmits information (transmission capacity information) indicating the transmission capacities # 1 to # 3 of the radio lines # 1 to # 3 to the dividing circuit 120, respectively. As a result, transmission capacities # 1 to # 3 are set in the dividing circuit 120.
- the dividing circuit 120 of the wireless communication apparatus A 100A calculates the ratio of the transmission capacities of the wireless lines # 1 to # 3 (S106). Specifically, the dividing circuit 120 determines the transmission capacity # 1: transmission capacity # from the transmission capacity # 1 to # 3 of each of the radio lines # 1 to # 3 received from the control unit 200 as a ratio of the transmission capacity. 2: Calculate transmission capacity # 3.
- the dividing circuit 120 calculates the ratio (ratio) of the transmission capacity of the radio line # 1 as transmission capacity # 1 / (transmission capacity # 1 + transmission capacity # 2 + transmission capacity # 3). Similarly, the dividing circuit 120 calculates the ratio of the transmission capacity of the radio line # 2 as transmission capacity # 2 / (transmission capacity # 1 + transmission capacity # 2 + transmission capacity # 3). Similarly, the dividing circuit 120 calculates the transmission capacity ratio of the wireless line # 3 as transmission capacity # 3 / (transmission capacity # 1 + transmission capacity # 2 + transmission capacity # 3).
- the transmission capacity # 1 of the wireless line # 1 is 50 Mbps
- the transmission capacity # 2 of the wireless line # 2 is 100 Mbps
- the transmission capacity # 3 of the wireless line # 3 is 150 Mbps.
- the dividing circuit 120 of the wireless communication apparatus A 100A divides the packet into fragments based on the calculated transmission capacity ratio (S108). That is, the dividing circuit 120 generates a fragment by dividing the packet by the ratio of the calculated transmission capacity of the wireless line. In other words, the dividing circuit 120 divides the packet into fragments having a size corresponding to the calculated transmission capacity ratio of the wireless line.
- the dividing circuit 120 divides the packet so that the ratio of the sizes of the fragments is transmission capacity # 1: transmission capacity # 2: transmission capacity # 3. Assuming that the size of the packet # 1 is X bytes, the dividing circuit 120 determines the size of the fragment # 1-1 corresponding to the wireless line # 1 as X * transmission capacity # 1 / (transmission capacity # 1 + transmission capacity # 2 + Transmission capacity # 3) Calculate as [bytes]. Similarly, the dividing circuit 120 calculates the size of the fragment # 1-2 corresponding to the wireless line # 2 as X * transmission capacity # 2 / (transmission capacity # 1 + transmission capacity # 2 + transmission capacity # 3) [bytes]. To do. Similarly, the dividing circuit 120 calculates the size of the fragment # 1-3 corresponding to the wireless line # 3 as X * transmission capacity # 3 / (transmission capacity # 1 + transmission capacity # 2 + transmission capacity # 3) [bytes]. To do.
- the dividing circuit 120 divides the packet into fragments at the calculated dividing ratio.
- the dividing circuit 120 divides packet # 1 into fragment # 1-1 of X * 1/6 byte and fragment # 1-1 of X * 2/6 byte. It is divided into 1-2 and X * 3/6 byte fragment # 1-3. That is, the size of fragment # 1-1 corresponds to the size (ratio) of the transmission capacity of radio channel # 1.
- the size of fragment # 1-2 corresponds to the size (ratio) of the transmission capacity of radio channel # 2.
- the size of fragment # 1-3 corresponds to the size (ratio) of the transmission capacity of radio channel # 3.
- the dividing circuit 120 of the wireless communication apparatus A 100A adds (inserts) management information to each fragment (S110).
- the management information is control information such as overhead (OH).
- the management information includes an identifier of the original packet of the fragment and order information indicating the order of the original packet of the fragment.
- the wireless communication apparatus B 100B on the receiving side can restore the original packet by combining the fragments by using this management information.
- fragment # 1-1 is first
- fragment # 1-2 is second
- fragment # 1-3 is third. Therefore, the dividing circuit 120 adds management information including the identifier of the packet # 1 and the order information indicating the first to the fragment # 1-1. Similarly, the dividing circuit 120 adds management information including the identifier of the packet # 1 and the second order information to the fragment # 1-2. Similarly, the dividing circuit 120 adds management information including the identifier of the packet # 1 and the third order information to the fragment # 1-3.
- the wireless communication device A 100A transmits each fragment to the wireless communication device B 100B on the receiving side via a wireless channel having a transmission capacity corresponding to the size of the fragment (S112).
- the dividing circuit 120 sends the fragment # 1-1 having a size corresponding to the ratio of the transmission capacity # 1 of the wireless line # 1 to the wireless transmission / reception processing circuit 140-1 corresponding to the wireless line # 1.
- the dividing circuit 120 transmits the fragment # 1-2 having a size corresponding to the ratio of the transmission capacity # 2 of the wireless line # 2 to the wireless transmission / reception processing circuit 140-2 corresponding to the wireless line # 2.
- the dividing circuit 120 transmits the fragment # 1-3 having a size corresponding to the ratio of the transmission capacity # 3 of the wireless line # 3 to the wireless transmission / reception processing circuit 140-3 corresponding to the wireless line # 3.
- the dividing circuit 120 transmits the fragment # 1-1 having a size corresponding to the ratio of the transmission capacity # 1 of the wireless line # 1 to the wireless transmission / reception processing circuit 140-1
- the wireless transmission / reception processing circuit 140-1 performs processing such as modulation processing and amplification on the fragment # 1-1, and transmits a radio wave to the reception-side wireless communication device B100B via the wireless line # 1.
- the wireless transmission / reception processing circuit 140-2 performs processing such as modulation processing and amplification on the fragment # 1-2, and transmits radio waves to the reception-side wireless communication device B100B via the wireless line # 2.
- the wireless transmission / reception processing circuit 140-3 performs modulation processing and amplification processing on the fragment # 1-3, and transmits radio waves to the reception-side wireless communication device B100B via the wireless line # 3.
- the wireless communication device B 100B receives each fragment from the transmitting-side wireless communication device A 100A (S302). Specifically, the wireless transmission / reception processing circuit 140-1 of the wireless communication apparatus B100B receives the radio wave including the fragment # 1-1 via the wireless line # 1. Then, the radio transmission / reception processing circuit 140-1 performs demodulation processing, amplification processing, and the like, and transmits the obtained fragment # 1-1 to the restoration circuit 160.
- the wireless transmission / reception processing circuit 140-2 of the wireless communication apparatus B100B receives the radio wave including the fragment # 1-2 via the wireless line # 2. Then, the radio transmission / reception processing circuit 140-2 performs demodulation processing, amplification processing, and the like, and transmits the obtained fragment # 1-2 to the restoration circuit 160.
- the wireless transmission / reception processing circuit 140-3 of the wireless communication apparatus B100B receives the radio wave including the fragment # 1-3 via the wireless line # 3. Then, the radio transmission / reception processing circuit 140-3 performs demodulation processing, amplification processing, and the like, and transmits the obtained fragment # 1-3 to the restoration circuit 160.
- the transmission capacities of the radio lines # 1 to # 3 are different from each other.
- the radio communication apparatus A100A on the transmission side has the size of those transmission capacities.
- the packet is divided into fragments. That is, the transmitting-side radio communication apparatus A100A generates fragments having a size corresponding to the size of the transmission capacity of the radio lines # 1 to # 3, and uses these fragments as the corresponding radio lines # 1 to # 100. Transmitting via each of line # 3. That is, the wireless communication apparatus A100A transmits a fragment of a large size via a wireless line having a large transmission capacity, and transmits a fragment of a small size via a wireless line having a small transmission capacity.
- the transmission capacity of the wireless line when data of the same size is transmitted via the wireless line, the data transmitted via the wireless line having a large transmission capacity is received early, and the wireless line having a small transmission capacity is received. The data transmitted via is received late.
- the time when the wireless transmission / reception processing circuit 140-1 receives the fragment # 1-1 and the wireless transmission / reception processing circuit 140-2 are the fragment # 1. -2 and the time for the wireless transmission / reception processing circuit 140-3 to receive fragment # 1-3 become smaller.
- the wireless transmission / reception processing circuits 140-1 to 140-3 can receive the fragments # 1-1 to # 1-3 in substantially the same time. Furthermore, in other words, when data is transmitted through the wireless lines # 1 to # 3, it is possible to suppress the occurrence of a transmission delay difference between the wireless lines.
- the restoration circuit 160 of the wireless communication apparatus B 100B combines the fragments to restore the original packet (S304). Then, the restoration circuit 160 transmits the restored packet to the data line 60 (60B) (S306). Specifically, the restoration circuit 160 receives fragments # 1-1 to # 1-3 from the radio transmission / reception processing circuits 140-1 to 140-3, respectively. Then, the restoration circuit 160 uses the management information added to the fragments # 1-1 to # 1-3 to detect the identifier of the original packet of the fragment and the order of the fragments. As a result, the restoration circuit 160 combines the fragments # 1-1 to # 1-3 in the order in the original packet.
- the management information indicating the first is added to the fragment # 1-1
- the management information indicating the second is added to the fragment # 1-2
- the third is indicated to the fragment # 1-3.
- Management information is added. Therefore, the restoration circuit 160 combines the fragments # 1-1 to # 1-3 with the fragment # 1-1 as the first, the fragment # 1-2 as the second, and the fragment # 1-3 as the third. When combining, the restoration circuit 160 removes the management information. As a result, the restoration circuit 160 restores the original packet # 1.
- the timing at which the restoration circuit 160 receives each of the plurality of fragments is shifted, even if one fragment is received earlier, the other fragment is not received. Therefore, a buffer that satisfies the size of the received data is provided, the fragments received earlier are stored in the buffer, and when all fragments are received, the fragments stored in the buffer are extracted and combined. There is a need.
- restoration circuit 160 since radio transmission / reception processing circuits 140-1 to 140-3 receive fragments # 1-1 to # 1-3 at substantially the same time, restoration circuit 160 also has Fragments # 1-1 to # 1-3 are received almost simultaneously from the radio transmission / reception processing circuits 140-1 to 140-3, respectively. Therefore, it is possible to restore the packet without providing a large buffer in the receiving-side radio communication apparatus B100B.
- the fragment division size can be determined each time. That is, when the wireless communication apparatus A 100A on the transmission side receives the next packet # 2 immediately after transmitting the packet # 1, it is assumed that the modulation method of a certain radio channel is changed by the adaptive modulation processing. Even in such a case, the control unit 200 can acquire the transmission capacity corresponding to the modulation method of each wireless line at the stage of processing the packet # 2 by the process of S20 of FIG. Therefore, even if the transmission capacity changes due to the change of the modulation method, the dividing circuit 120 uses the size corresponding to the changed transmission capacity by the process of S108 in FIG. Can be divided into fragments.
- a minimum fragment size is set.
- the minimum size of an Ethernet (registered trademark) frame (packet) is defined as 64 bytes.
- the minimum size is 64 bytes, but this value is an example, and the minimum size can be set arbitrarily.
- the configurations of the wireless communication system 50 and the wireless communication device 100 according to the second embodiment are substantially the same as the configurations shown in FIGS. Further, the operation of radio communication apparatus B 100B on the receiving side is also substantially the same as the processing operation shown in FIG.
- FIG. 10 is a flowchart of operations performed by the transmitting-side radio communication apparatus A 100A according to the second embodiment.
- FIG. 11 is a diagram illustrating a data flow in radio communication apparatus 100 (radio communication apparatus A100A) on the transmission side. In FIG. 11, the components of the wireless communication device 100 are omitted as appropriate.
- the wireless communication device A100A receives the packet via the data line 60 in the same manner as the processing of S102 of FIG. 5 (S402). Specifically, the dividing circuit 120 receives the packet # 2 as shown in FIG. Next, the control unit 200 of the wireless communication apparatus A 100A sets the transmission capacity of each wireless line as in S20 of FIG. 5 (S44). The processing content of S44 is substantially the same as the processing of S20 in FIG.
- the dividing circuit 120 of the wireless communication apparatus A 100A calculates the ratio of the transmission capacities of the wireless lines # 1 to # 3 in the same manner as S106 in FIG. 5 (S406). Specifically, the dividing circuit 120 determines the transmission capacity # 1: transmission capacity # from the transmission capacity # 1 to # 3 of each of the radio lines # 1 to # 3 received from the control unit 200 as a ratio of the transmission capacity. 2: Calculate transmission capacity # 3.
- the dividing circuit 120 calculates the ratio (ratio) of the transmission capacity of the radio line # 1 as transmission capacity # 1 / (transmission capacity # 1 + transmission capacity # 2 + transmission capacity # 3). Similarly, the dividing circuit 120 calculates the ratio of the transmission capacity of the radio line # 2 as transmission capacity # 2 / (transmission capacity # 1 + transmission capacity # 2 + transmission capacity # 3). Similarly, the dividing circuit 120 calculates the transmission capacity ratio of the wireless line # 3 as transmission capacity # 3 / (transmission capacity # 1 + transmission capacity # 2 + transmission capacity # 3).
- the transmission capacity # 1 of the wireless line # 1 is 50 Mbps
- the transmission capacity # 2 of the wireless line # 2 is 100 Mbps
- the dividing circuit 120 of the wireless communication apparatus A 100A divides the packet into fragments based on the calculated transmission capacity ratio, as in S108 of FIG. 5 (S408). If the size of the packet # 2 is Y bytes, the dividing circuit 120 determines the size of the fragment # 2-1 corresponding to the wireless line # 1 as Y * transmission capacity # 1 / (transmission capacity # 1 + transmission capacity # 2 + Transmission capacity # 3) Calculate as [bytes]. Similarly, the dividing circuit 120 calculates the size of the fragment # 2-2 corresponding to the wireless line # 2 as Y * transmission capacity # 2 / (transmission capacity # 1 + transmission capacity # 2 + transmission capacity # 3) [bytes]. To do. Similarly, the dividing circuit 120 calculates the size of the fragment # 2-3 corresponding to the wireless line # 3 as Y * transmission capacity # 3 / (transmission capacity # 1 + transmission capacity # 2 + transmission capacity # 3) [bytes]. To do.
- the dividing circuit 120 divides the packet into fragments at the calculated dividing ratio.
- the dividing circuit 120 converts the packet # 2 into Y * (1/6)
- the fragment is divided into byte fragment # 2-1, Y * (2/6) byte fragment # 2-2, and Y * (3/6) byte fragment # 2-3. That is, the size of fragment # 2-1 corresponds to the size (ratio) of the transmission capacity of radio channel # 1.
- the size of the fragment # 2-2 corresponds to the size (ratio) of the transmission capacity of the radio line # 2.
- the size of fragment # 2-3 corresponds to the size (ratio) of the transmission capacity of radio line # 3.
- the dividing circuit 120 of the wireless communication apparatus A 100A adds management information to each fragment, similarly to S110 of FIG. 5 (S410).
- the dividing circuit 120 of the wireless communication apparatus A 100A determines whether each fragment size is smaller than the minimum size (S420). For example, assuming that the minimum size is 64 bytes, the dividing circuit 120 determines whether or not the sizes of the fragments # 2-1 to # 2-3 are smaller than 64 bytes.
- the wireless communication device A100A like S112 in FIG. The data is transmitted to the radio communication device B 100B on the receiving side via a radio line having a transmission capacity corresponding to the size (S412).
- division circuit 120 corresponds to a fragment having a size smaller than the minimum size.
- the wireless line is excluded from the wireless lines used for fragment (packet) transmission (S422), and the process returns to S406.
- the dividing circuit 120 excludes the wireless line # 1 corresponding to the fragment # 2-1 from the wireless line used for fragment (packet) transmission.
- the dividing circuit 120 recalculates the ratio of the transmission capacities of the wireless lines # 2 and # 3 excluding the wireless line # 1 (S406). Specifically, the dividing circuit 120 calculates transmission capacity # 2: transmission capacity # 3 as a ratio of transmission capacity from the transmission capacities # 2 and # 3 of the radio lines # 2 and # 3, respectively. Furthermore, the dividing circuit 120 calculates the ratio of the transmission capacity of the radio line # 2 as transmission capacity # 2 / (transmission capacity # 2 + transmission capacity # 3). Similarly, the dividing circuit 120 calculates the ratio of the transmission capacity of the radio line # 3 as transmission capacity # 3 / (transmission capacity # 2 + transmission capacity # 3).
- the dividing circuit 120 of the wireless communication apparatus A 100A re-divides the packet into fragments based on the transmission capacity ratio calculated again (S408).
- the dividing circuit 120 calculates the size of the fragment # 2-2 corresponding to the wireless line # 2 as Y * transmission capacity # 2 / (transmission capacity # 2 + transmission capacity # 3) [bytes].
- the dividing circuit 120 calculates the size of the fragment # 2-3 corresponding to the wireless line # 3 as Y * transmission capacity # 3 / (transmission capacity # 2 + transmission capacity # 3) [bytes].
- the dividing circuit 120 redivides the packet into fragments at the recalculated division ratio. In the example of FIG. 11, the dividing circuit 120 divides the packet # 2 into a fragment # 2-2 of Y * (2/5) bytes and a fragment # 2-3 of Y * (3/5) bytes. .
- the dividing circuit 120 of the wireless communication apparatus A 100A adds management information to each fragment again (S410), and determines whether each fragment size is smaller than the minimum size (S420). If the size of either fragment # 2-2 or # 2-3 is smaller than 64 bytes (YES in S420), the process of S422 is repeated again.
- wireless communication apparatus A100A determines fragments # 2-2 and # 2-3 as the fragments.
- the data is transmitted to the radio communication device B 100B on the receiving side via a radio line having a transmission capacity corresponding to the size (S412).
- the dividing circuit 120 corresponds to the fragment # 2-2 having a size corresponding to the ratio of the transmission capacity # 2 of the wireless line # 2 to the wireless line # 2.
- the dividing circuit 120 transmits the fragment # 2-3 having a size corresponding to the ratio of the transmission capacity # 3 of the wireless line # 3 to the wireless transmission / reception processing circuit 140-3 corresponding to the wireless line # 3. To do.
- the wireless transmission / reception processing circuit 140-2 performs processing such as modulation and amplification on the fragment # 2-2, and transmits radio waves to the reception-side wireless communication device B100B via the wireless line # 2.
- the radio transmission / reception processing circuit 140-3 performs modulation processing, amplification processing, and the like on the fragment # 2-3, and transmits radio waves to the radio communication device B100B on the reception side via the radio line # 3.
- the dividing circuit 120 does not transmit the fragment to the wireless transmission / reception processing circuit 140-1 corresponding to the wireless line # 1, and thus the wireless transmission / reception processing circuit 140-1 receives the fragment on the wireless communication device on the receiving side. Not transmitted to B100B.
- the wireless transmission / reception processing circuit 140 determines that there is an error and discards the fragment. As a result, a part of the data constituting the packet is lost, which may lead to a delay in transmission time.
- the dividing circuit 120 is configured not to transmit a fragment smaller than the minimum size. Therefore, it is possible to prevent a part of the data from being discarded while suppressing a difference in transmission delay between the wireless channels.
- the second embodiment is applicable even when the transmission capacities of the radio lines # 1 to # 3 are the same.
- the wireless lines # 1 to # 3 are 300 Mbps. That is, the ratio of the transmission capacities # 1 to # 3 of the wireless lines # 1 to # 3 is 1: 1: 1.
- the dividing circuit 120 receives the packet # 3 having the size Z [bytes]
- the dividing circuit 120 firstly sets the packet # 3 to a size of Z * 1/3, as indicated by a one-dot chain line A. Divide into fragments # 3-1 to # 3-3.
- the dividing circuit 120 excludes an arbitrary wireless line from wireless lines used for fragment (packet) transmission. For example, when the priority of the wireless line # 3 is set lower than that of other wireless lines, the dividing circuit 120 may exclude the wireless line # 3.
- the dividing circuit 120 may divide the packet # 3 into fragments # 3-1 and # 3-2 each having a size of Z * 1/2. Further, the wireless transmission / reception processing circuits 140-1 and 140-2 may transmit the fragments # 3-1 and # 3-2 via the wireless line # 1 and the wireless line # 2, respectively.
- the dividing circuit 120 divides the packet again, but the dividing circuit 120 may not actually divide the packet when comparing the fragment size with the minimum size. That is, the dividing circuit 120 may calculate only the fragment size from the transmission capacity ratio, and compare the sum of the fragment size and the management information size with the minimum size. In this case, the dividing circuit 120 may divide the packet into fragments of that size only when the size of all fragments (including the size of management information) is equal to or larger than the minimum size.
- a wireless line in which a communication failure has occurred is configured not to be used for packet (fragment) transmission.
- the configurations of the wireless communication system 50 and the wireless communication device 100 according to the third embodiment are substantially the same as the configurations shown in FIGS. Further, the operation of radio communication apparatus B 100B on the receiving side is also substantially the same as the processing operation shown in FIG.
- FIG. 13 is a flowchart of operations performed by the wireless communication apparatus A100A on the transmission side according to the third embodiment.
- FIG. 14 is a diagram illustrating a data flow in radio communication apparatus 100 (radio communication apparatus A100A) on the transmission side. In FIG. 14, the components of the wireless communication apparatus 100 are omitted as appropriate.
- the wireless communication device A100A receives the packet via the data line 60 in the same manner as the processing of S102 of FIG. 5 (S502). Specifically, the dividing circuit 120 receives the packet # 1 as shown in FIG.
- the control unit 200 of the wireless communication apparatus A 100A determines whether there is a wireless line in which a communication failure has occurred (S504). When there is a wireless line in which a communication failure has occurred (YES in S504), the control unit 200 excludes the wireless line from the wireless line used for transmission (S506). On the other hand, when there is no wireless line in which a communication failure has occurred (NO in S504), the control unit 200 skips the process of S506 and performs the process of S54 described later.
- the wireless transmission / reception processing circuits 140-1 to 140-3 detect that a communication failure has occurred when a communication failure has occurred in the corresponding wireless line # 1 to wireless line # 3, respectively. Further, when the wireless transmission / reception processing circuits 140-1 to 140-3 detect that a communication failure has occurred in the wireless line # 1 to the wireless line # 3, a notification (failure occurrence notification) indicating that fact is sent to the control unit 200. Send to.
- the control unit 200 When receiving the failure occurrence notification from the wireless transmission / reception processing circuit 140, the control unit 200 determines that a failure has occurred in the wireless line corresponding to the wireless transmission / reception processing circuit 140 that has transmitted the failure occurrence notification. In that case, the control unit 200 excludes the wireless line corresponding to the wireless transmission / reception processing circuit 140 that transmitted the failure occurrence notification from the wireless line used for transmission, and performs the subsequent processing.
- the wireless transmission / reception processing circuit 140-3 transmits a failure occurrence notification to the control unit 200.
- the control unit 200 excludes the wireless line # 3 corresponding to the wireless transmission / reception processing circuit 140-3 from the wireless line used for transmission.
- the control unit 200 of the wireless communication apparatus A 100A sets the transmission capacity of each wireless line in the same manner as S20 in FIG. 5 (S54).
- the control unit 200 sets the transmission capacity for the radio channel excluding the radio channel in which the failure has occurred.
- the control unit 200 sets transmission capacities # 1 and # 2 for the radio lines # 1 and # 2 other than the radio line # 3, respectively.
- the specific processing content of S54 is substantially the same as the processing of S20 in FIG.
- the dividing circuit 120 of the wireless communication device A 100A calculates the ratio of the transmission capacity of the wireless line as in S106 of FIG. 5 (S516).
- the dividing circuit 120 calculates the ratio of the transmission capacities of the wireless line # 1 and the wireless line # 2.
- the dividing circuit 120 determines the transmission capacity # 1: transmission capacity # from the transmission capacity # 1 and # 2 of the wireless line # 1 and the wireless line # 2 received from the control unit 200 as a ratio of the transmission capacity. 2 is calculated.
- the dividing circuit 120 calculates the ratio (ratio) of the transmission capacity of the radio line # 1 as transmission capacity # 1 / (transmission capacity # 1 + transmission capacity # 2).
- the dividing circuit 120 calculates the ratio of the transmission capacity of the radio line # 2 as transmission capacity # 2 / (transmission capacity # 1 + transmission capacity # 2).
- the transmission capacity # 1 of the wireless line # 1 is 50 Mbps
- the dividing circuit 120 of the wireless communication apparatus A 100A divides the packet into fragments based on the calculated transmission capacity ratio as in S108 of FIG. 5 (S518). Assuming that the size of the packet # 1 is X bytes, the dividing circuit 120 sets the size of the fragment # 1-1 corresponding to the wireless line # 1 to X * transmission capacity # 1 / (transmission capacity # 1 + transmission capacity # 2 ) Calculate [bytes]. Similarly, the dividing circuit 120 calculates the size of the fragment # 1-2 corresponding to the radio line # 2 as X * transmission capacity # 2 / (transmission capacity # 1 + transmission capacity # 2) [bytes].
- the dividing circuit 120 divides the packet into fragments at the calculated dividing ratio.
- the dividing circuit 120 divides packet # 1 into fragment # 1-1 of X * (1/3) bytes and X * (2/3).
- the size of fragment # 1-2 corresponds to the size (ratio) of the transmission capacity of radio channel # 2 in radio channel # 1 and radio channel # 2.
- the dividing circuit 120 of the wireless communication apparatus A 100A adds management information to each fragment, similarly to S110 of FIG. 5 (S520).
- the wireless communication device A100A sends each fragment to the receiving-side wireless communication device B100B via a wireless line having a transmission capacity corresponding to the size of the fragment. Transmit (S522).
- the dividing circuit 120 converts the fragment # 1-1 having a size corresponding to the ratio of the transmission capacity # 1 of the wireless line # 1 to the wireless transmission / reception processing circuit 140-1 corresponding to the wireless line # 1. Send to. Further, the dividing circuit 120 transmits the fragment # 1-2 having a size corresponding to the ratio of the transmission capacity # 2 of the wireless line # 2 to the wireless transmission / reception processing circuit 140-2 corresponding to the wireless line # 2. To do.
- the wireless transmission / reception processing circuit 140-1 performs processing such as modulation processing and amplification on the fragment # 1-1, and transmits a radio wave to the reception-side wireless communication device B100B via the wireless line # 1.
- the wireless transmission / reception processing circuit 140-2 performs processing such as modulation processing and amplification on the fragment # 1-2, and transmits radio waves to the reception-side wireless communication device B100B via the wireless line # 2.
- the dividing circuit 120 does not transmit the fragment to the wireless transmission / reception processing circuit 140-3 corresponding to the wireless line # 3. Accordingly, the wireless transmission / reception processing circuit 140-3 transmits the fragment to the wireless communication device on the receiving side. Not transmitted to B100B.
- radio communication apparatus 100 When attempting to transmit data via a wireless line where a communication failure has occurred, there is a risk that a large transmission delay will occur only on that wireless line.
- radio communication apparatus 100 excludes radio lines in which communication failure has occurred and transmits data using other radio lines. Therefore, it is possible to further suppress the occurrence of a difference in transmission delay in each wireless line.
- the wireless communication apparatus A 100A receives the packet # 1 in the example of FIG. 14 and transmits the fragments # 1-1 and # 1-2, and then receives the packet # 2 as illustrated in FIG. A case where the failure that occurred in # 3 is recovered will be described.
- the dividing circuit 120 calculates the ratio of the transmission capacities of the radio lines # 1 to # 3 as 1: 2: 3. Further, assuming that the size of packet # 2 is Y bytes, dividing circuit 120 divides packet # 2 into fragment # 2-1 having a size of Y * 1/6 and fragment # 2-1 having a size of Y * 2/6. It is divided into 2-2 and fragment # 2-3 whose size is Y * 3/6.
- the configuration and operation according to the third embodiment described above can also be applied to the second embodiment. That is, the processing in S504 and S506 in FIG. 13 may be executed between S402 and S44 in FIG. 10 according to the second embodiment.
- the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention.
- the number of the plurality of wireless lines is three (wireless lines # 1 to # 3).
- the number of wireless lines may be any number as long as it is plural.
- steps can be changed as appropriate.
- One or more of the plurality of processes (steps) may be omitted.
- the process of S102 of FIG. 5 may be performed after the process of S20 or the process of S106. The same applies to FIGS. 10 and 13.
- the wireless communication device A 100A and the wireless communication device B 100B may include only one of the dividing circuit 120 and the restoration circuit 160. That is, for example, when data is transmitted from the wireless communication device A 100A to the wireless communication device B 100B, but no data is transmitted from the wireless communication device B 100B to the wireless communication device A 100A, the wireless communication device A 100A includes a dividing circuit. Although 120 is included, the restoration circuit 160 may not be included. In this case, the wireless communication apparatus B 100B includes the restoration circuit 160 but may not include the dividing circuit 120.
- the control unit 200 stores the modulation scheme correspondence table.
- the conversion scheme information is converted into the transmission capacity, but the transmission capacity of the radio line is set.
- the method is not limited to this.
- the control unit 200 may receive information indicating the bandwidth (transmission capacity) of the corresponding wireless line from the wireless transmission / reception processing circuit 140. In this case, the control unit 200 may not store the modulation scheme correspondence table.
- the ratio of the fragment sizes before the management information is added may be the ratio of the transmission capacity of the radio channel, or the ratio of the fragment sizes after the management information is added is the ratio of the transmission capacity of the radio channel. It may be a ratio. In the former case, it is only necessary to divide the packet into fragments according to the ratio of the transmission capacity of the radio line, so the processing becomes simple. In the latter case, the ratio of the transmission capacity of the radio line and the ratio of the size of the fragment (including management information) that is actually transmitted can be made to exactly match. It is possible to suppress.
- the packet is divided into fragments according to the transmission capacity ratio of the radio line, but it is not necessary that the transmission capacity ratio and the division ratio exactly match each other.
- a weighting value may be multiplied according to the priority of the wireless line or the radio wave condition. For example, in the example of FIG. 7, when the priority of the radio line # 1 is high, the size of the fragment # 1-1 may be set to X * 1/6 * k (k is a coefficient larger than 1). The sizes of the fragments # 1-2 and # 1-3 may be adjusted as appropriate.
- fragment size ratio does not need to correspond exactly to the transmission capacity ratio.
- a fragment transmitted via the wireless line # 1 whose transmission capacity is the transmission capacity # 1 is referred to as fragment # 1
- fragment # 2 a fragment transmitted via the wireless line # 2 whose transmission capacity is the transmission capacity # 2 is fragmented
- the fragment transmitted through the wireless line # 3 whose transmission capacity is the transmission capacity # 3 is fragment # 3.
- transmission capacity # 1 ⁇ transmission capacity # 2 ⁇ transmission capacity # 3 the size of fragment # 1 ⁇ the size of fragment # 2 ⁇ the size of fragment # 3 may be satisfied.
- the present invention has been described as a hardware configuration, but the present invention is not limited to this.
- the present invention can also realize processing of each circuit in the wireless communication device by causing a CPU (Central Processing Unit) to execute a computer program.
- a CPU Central Processing Unit
- Non-transitory computer readable media include various types of tangible storage media (tangible storage medium).
- Examples of non-transitory computer-readable media include magnetic recording media (eg flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (eg magneto-optical discs), CD-ROMs (Read Only Memory), CD-Rs, CD-R / W, semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable ROM), flash ROM, RAM (Random Access Memory)) are included.
- the program may also be supplied to the computer by various types of temporary computer-readable media. Examples of transitory computer readable media include electrical signals, optical signals, and electromagnetic waves.
- the temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.
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Abstract
Description
実施の形態の説明に先立って、図1を用いて、本発明にかかる実施の形態の概要を説明する。図1は、本発明の実施の形態にかかる無線通信装置1の概要を示す図である。図1に示すように、無線通信装置1は、分割手段12と、送信手段14とを有する。
本発明の実施の形態にかかる無線通信装置1によれば、複数の無線回線において伝送遅延の差が生じることを抑制することができる。
以下、図面を参照して実施の形態1について説明する。
図2は、実施の形態1にかかる無線通信システム50を示す図である。無線通信システム50は、無線通信装置A100A(第1の無線通信装置)と、無線通信装置B100B(第2の無線通信装置)とから構成される。無線通信装置A100Aと無線通信装置B100Bとは、3つの無線回線#1~無線回線#3(第1の無線回線,第2の無線回線)を介して無線通信可能に接続されている。
無線送受信処理回路140-1~140-3は、それぞれ、無線回線#1~無線回線#3に対応付けられている。つまり、無線送受信処理回路140-1は、アンテナ102-1と接続されている。また、無線送受信処理回路140-2は、アンテナ102-2と接続されている。また、無線送受信処理回路140-3は、アンテナ102-3と接続されている。
図5及び図6は、送信側の無線通信装置100(無線通信装置A100A)における動作を示すフローチャートである。図7は、送信側の無線通信装置100(無線通信装置A100A)におけるデータ(パケット及びフラグメント)の流れを例示する図である。
なお、図7及び図9において、無線通信装置100の構成要素は、適宜、省略されている。
このようにして、分割回路120は、無線回線の伝送容量の比及び各無線回線の伝送容量の比率を算出する。
無線通信装置B100Bは、送信側の無線通信装置A100Aから、各フラグメントを受信する(S302)。具体的には、無線通信装置B100Bの無線送受信処理回路140-1は、無線回線#1を介して、フラグメント#1-1を含む電波を受信する。そして、無線送受信処理回路140-1は、復調処理及び増幅処理等を行って、得られたフラグメントを#1-1を、復元回路160に対して送信する。
具体的には、復元回路160は、無線送受信処理回路140-1~140-3から、それぞれフラグメント#1-1~#1-3を受信する。そして、復元回路160は、フラグメント#1-1~#1-3に付加された管理情報を用いて、フラグメントの元のパケットの識別子及びフラグメントの順序を検出する。これによって、復元回路160は、フラグメント#1-1~#1-3を、元のパケット内における順序で結合する。
次に、実施の形態2について説明する。実施の形態2においては、実施の形態1にかかる構成及び動作に加えて、フラグメントの最小サイズが設定されるように構成されている。例えば、イーサネット(登録商標)のフレーム(パケット)の最小サイズは、64バイトと定められている。実施の形態2においては、このような場合であっても、以下に説明するように、各無線回線の伝送容量の大きさに対応したサイズでデータを分割して、フラグメントを生成することが可能である。なお、以下の実施の形態においては、最小サイズを64バイトとするが、この値は例示であって、最小サイズは任意に設定され得る。
次に、無線通信装置A100Aの分割回路120は、各フラグメントサイズが最小サイズよりも小さいか否かを判断する(S420)。例えば、最小サイズが64バイトであるとすると、分割回路120は、フラグメント#2-1~#2-3のサイズが、それぞれ、64バイトより小さいか否かを判断する。ここで、フラグメント#2-1~#2-3すべてのサイズが64バイト以上である場合(S420のNO)、無線通信装置A100Aは、図5のS112と同様に、各フラグメントを、そのフラグメントのサイズに対応した大きさの伝送容量の無線回線を介して、受信側の無線通信装置B100Bに対して送信する(S412)。
具体的には、例えば、図11の一点鎖線Aで囲まれた部分に示すように、フラグメント#2-1のサイズが最小サイズよりも小さい場合、つまり、Y*1/6<64[バイト]である場合、分割回路120は、フラグメント#2-1に対応する無線回線#1を、フラグメント(パケット)の伝送に用いる無線回線から除外する。
具体的には、分割回路120は、無線回線#2,無線回線#3それぞれの伝送容量#2,#3から、伝送容量の比として、伝送容量#2:伝送容量#3を算出する。さらに、分割回路120は、無線回線#2の伝送容量の比率を、伝送容量#2/(伝送容量#2+伝送容量#3)と算出する。同様に、分割回路120は、無線回線#3の伝送容量の比率を、伝送容量#3/(伝送容量#2+伝送容量#3)と算出する。
さらに、分割回路120は、算出し直された分割比で、パケットをフラグメントに分割し直す。図11の例では、分割回路120は、パケット#2を、Y*(2/5)バイトのフラグメント#2-2と、Y*(3/5)バイトのフラグメント#2-3とに分割する。
このとき、分割回路120は、無線回線#1に対応する無線送受信処理回路140-1に対してフラグメントを送信せず、したがって、無線送受信処理回路140-1は、フラグメントを受信側の無線通信装置B100Bに対して送信しない。
次に、実施の形態3について説明する。実施の形態3においては、実施の形態1にかかる構成及び動作に加えて、通信障害が発生した無線回線をパケット(フラグメント)の伝送に使用しないように構成されている。
さらに、分割回路120は、無線回線#1の伝送容量の比率(割合)を、伝送容量#1/(伝送容量#1+伝送容量#2)と算出する。同様に、分割回路120は、無線回線#2の伝送容量の比率を、伝送容量#2/(伝送容量#1+伝送容量#2)と算出する。
次に、無線通信装置A100Aは、図5のS112と同様に、各フラグメントを、そのフラグメントのサイズに対応した大きさの伝送容量の無線回線を介して、受信側の無線通信装置B100Bに対して送信する(S522)。
無線通信装置A100Aが、図14の例におけるパケット#1を受信してフラグメント#1-1,#1-2を送信したあと、図15に例示するように、パケット#2を受信し、無線回線#3で発生していた障害が回復した場合について説明する。
なお、本発明は上記実施の形態に限られたものではなく、趣旨を逸脱しない範囲で適宜変更することが可能である。
上述した実施の形態1においては、複数の無線回線の数を3つ(無線回線#1~無線回線#3)としたが、無線回線の数は、複数であればいくつであってもよい。
12 分割手段
14 送信手段
50 無線通信システム
60 データ回線
100 無線通信装置
120 分割回路
140 無線送受信処理回路
160 復元回路
200 制御部
Claims (14)
- 複数の無線回線を介して電波を送信する送信手段と、
前記複数の無線回線それぞれの伝送容量の大きさに対応したサイズでデータを分割して複数のフラグメントを生成する分割手段と
を有し、
前記送信手段は、前記複数のフラグメントそれぞれを、当該フラグメントのサイズに対応した大きさの伝送容量の無線回線を介して、他の無線通信装置に対して送信する
無線通信装置。 - 前記分割手段は、前記複数の無線回線のそれぞれの伝送容量の比率に基づいて、前記複数のフラグメントそれぞれのサイズを決定する
請求項1に記載の無線通信装置。 - 前記分割手段は、前記複数の無線回線の伝送容量の比に対応する分割比で前記データを分割して複数の前記フラグメントを生成し、
前記送信手段は、前記複数の無線回線のうちの第1の無線回線の伝送容量の比率に対応するサイズの第1のフラグメントを、当該第1の無線回線を介して送信する
請求項2に記載の無線通信装置。 - 前記分割手段は、前記複数のフラグメントのうちの第2のフラグメントのサイズが予め定められた最小サイズよりも小さくなる場合には、当該第2のフラグメントのサイズに対応した大きさの伝送容量の第2の無線回線を除いた1つ以上の前記無線回線それぞれの伝送容量の大きさに対応したサイズでデータを分割して1つ以上の前記フラグメントを生成し、
前記送信手段は、前記複数の無線回線のうち前記第2の無線回線を除いた前記1つ以上の無線回線を介して、1つ以上の前記フラグメントを送信する
請求項1から3のいずれか1項に記載の無線通信装置。 - 前記送信手段は、前記複数の無線回線のいずれかに障害が発生した場合に、障害が発生した無線回線を検知し、
前記分割手段は、前記複数の無線回線のうち前記障害が発生した無線回線を除いた1つ以上の前記無線回線それぞれの伝送容量の大きさに対応したサイズでデータを分割して1つ以上の前記フラグメントを生成し、
前記送信手段は、前記複数の無線回線のうち前記障害が発生した無線回線を除いた前記1つ以上の無線回線を介して、1つ以上の前記フラグメントを送信する
請求項1から4のいずれか1項に記載の無線通信装置。 - 前記分割手段は、前記データを前記他の無線通信装置で復元するための管理情報を前記複数のフラグメントそれぞれに付加し、
前記送信手段は、前記管理情報が付加された前記複数のフラグメントそれぞれを、前記複数の無線回線それぞれを介して送信する
請求項1から5のいずれか1項に記載の無線通信装置。 - 前記送信手段は、前記複数の無線回線ごとに変調方式を変更し、その変更された変調方式でデータを変調して前記複数の無線回線を介してデータを送信し、
前記分割手段は、前記変調方式の変更に伴って変化した伝送容量の大きさに対応したサイズでデータを分割して、複数のフラグメントを生成する
請求項1から6のいずれか1項に記載の無線通信装置。 - 複数の無線回線を介して電波を送信する第1の無線通信装置と、
前記複数の無線回線を介して前記電波を受信する第2の無線通信装置と
を有し、
前記第1の無線通信装置は、
前記複数の無線回線それぞれの伝送容量の大きさに対応したサイズでデータを分割して複数のフラグメントを生成する分割手段と
前記複数のフラグメントそれぞれを、当該フラグメントのサイズに対応した大きさの伝送容量の無線回線を介して、前記第2の無線通信装置に対して送信する送信手段と
を有し、
前記第2の無線通信装置は、
前記複数の無線回線それぞれを介して前記複数のフラグメントを受信する受信手段と、
前記複数のフラグメントを結合して元のデータを復元する復元手段と
を有する
無線通信システム。 - 前記分割手段は、前記複数の無線回線のそれぞれの伝送容量の比率に基づいて、前記複数のフラグメントそれぞれのサイズを決定する
請求項8に記載の無線通信システム。 - 前記分割手段は、前記複数の無線回線の伝送容量の比に対応する分割比で前記データを分割して複数の前記フラグメントを生成し、
前記送信手段は、前記複数の無線回線のうちの第1の無線回線の伝送容量の比率に対応するサイズの第1のフラグメントを、当該第1の無線回線を介して送信し、
前記受信手段は、前記第1の無線回線を介して前記第1のフラグメントを受信する
請求項9に記載の無線通信システム。 - 前記分割手段は、前記複数のフラグメントのうちの第2のフラグメントのサイズが予め定められた最小サイズよりも小さくなる場合には、当該第2のフラグメントのサイズに対応した大きさの伝送容量の第2の無線回線を除いた1つ以上の前記無線回線それぞれの伝送容量の大きさに対応したサイズでデータを分割して1つ以上の前記フラグメントを生成し、
前記送信手段は、前記複数の無線回線のうち前記第2の無線回線を除いた前記1つ以上の無線回線を介して、1つ以上の前記フラグメントを送信し、
前記受信手段は、前記第2の無線回線を除いた前記1つ以上の無線回線を介して、前記1つ以上のフラグメントを受信する
請求項8から10のいずれか1項に記載の無線通信システム。 - 前記送信手段は、前記複数の無線回線のいずれかに障害が発生した場合に、障害が発生した無線回線を検知し、
前記分割手段は、前記複数の無線回線のうち前記障害が発生した無線回線を除いた1つ以上の前記無線回線それぞれの伝送容量の大きさに対応したサイズでデータを分割して1つ以上の前記フラグメントを生成し、
前記送信手段は、前記複数の無線回線のうち前記障害が発生した無線回線を除いた前記1つ以上の無線回線を介して、1つ以上の前記フラグメントを送信し、
前記受信手段は、前記複数の無線回線のうち前記障害が発生した無線回線を除いた前記1つ以上の無線回線を介して、前記1つ以上のフラグメントを受信する
請求項8から11のいずれか1項に記載の無線通信システム。 - 前記分割手段は、前記データを前記第2の無線通信装置で復元するための管理情報を前記複数のフラグメントそれぞれに付加し、
前記送信手段は、前記管理情報が付加された前記複数のフラグメントそれぞれを、前記複数の無線回線それぞれを介して送信し、
前記受信手段は、前記管理情報が付加された前記複数のフラグメントそれぞれを、前記複数の無線回線それぞれを介して受信し、
前記復元手段は、前記管理情報を用いて前記複数のフラグメントを結合し、元のデータを復元する
請求項8から12のいずれか1項に記載の無線通信システム。 - 複数の無線回線それぞれの伝送容量の大きさに対応したサイズでデータを分割して複数のフラグメントを生成し、
前記複数のフラグメントそれぞれを、当該フラグメントのサイズに対応した大きさの伝送容量の無線回線を介して、他の無線通信装置に対して送信する
無線通信方法。
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