JP2007243446A - Wireless communication system and wireless apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To select a proper wireless communication medium in accordance with a change in respective communication environments of a plurality of wireless communication media and utilize the selected medium, and to achieve effective utilization of frequency and assurance of the QoS as the whole wireless communication system. <P>SOLUTION: In the wireless communication system, each of a wireless base station 1 and a wireless terminal 2 is provided with a data link layer packet switch means provided in a host layer of a data link layer in the wireless communication media and selecting the wireless communication media used in the unit of an IP packet or a data link layer packet, and includes a control means for controlling the data link layer packet switch means on the basis of a state of each of the wireless communication media or the data link layer packet switch means. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a wireless communication system and a wireless device.

Conventionally, by using a mobile IP (Internet Protocol) when communicating by connecting to a plurality of wireless communication media (for example, a cellular system and a wireless local area network (wireless LAN) system) installed in different places. A technique for performing seamless media switching is known (for example, see Non-Patent Document 1). Further, Non-Patent Document 2 describes an IP layer in the case where a mobile router is mounted on an ITS (Intelligent Transport System) vehicle that connects to and communicates with a plurality of wireless communication media (for example, a cellular system and a wireless LAN system). A technique for switching wireless communication media is described. Non-Patent Document 3 describes link aggregation in which a plurality of physical lines are aggregated and provided as one logical line. However, the technique described in Non-Patent Document 3 assumes that each line to be aggregated has the same speed, and does not consider a line whose communication quality changes, such as a wireless line. In selecting a wireless communication medium, mutual interference between base stations or QoS (Quality Of Service) is not considered.
Saito, et al., “Development of software for switching between different types of wireless communication media”, B-5-289, IEICE General Conference, 2003 Kashimura, et al. “Implementation of in-vehicle mobile router capable of switching communication media”, B-7-103, IEICE General Conference, 2003 IEEE802.3ad Standard (IEEE Computer Society LAN MAN Standards Committee) Aggregation of Multiple Link Segments, 2000.

  However, in the above-described conventional technology, the base stations of each wireless communication medium are individually configured, and their arrangements are different, and seamless media switching is performed at the IP layer using mobile IP. For this reason, since communication packet distribution is performed in the IP layer, there is a problem that an appropriate wireless communication medium cannot be selected and used according to a change in the communication environment of each wireless communication medium. In addition, since mutual interference between base stations is not taken into consideration, effective use of frequencies as a whole radio communication system cannot be achieved. Similarly, there is a problem that integrated QoS is not ensured when using a plurality of wireless communication media and a plurality of base stations.

  The present invention has been made in view of such circumstances, and its purpose is to select and use an appropriate wireless communication medium according to a change in the communication environment of each of a plurality of wireless communication media. An object of the present invention is to provide a radio communication system and a radio apparatus capable of realizing effective use of frequency and ensuring QoS as the entire radio communication system.

  In order to solve the above problems, a radio communication system according to the present invention is a data link layer in a radio communication medium in a radio communication system that performs radio communication between a radio base station and a radio terminal using a plurality of radio communication media. The wireless base station and the wireless terminal are provided with data link layer packet switch means for selecting a wireless communication medium to be used in units of IP packets or data link layer packets, respectively, and each wireless communication medium or data Control means for controlling the data link layer packet switch means based on the state of the link layer packet switch means.

  In the radio communication system according to the present invention, the control means selects a candidate of available radio communication media for each radio base station.

  The wireless device according to the present invention is a wireless device that performs wireless communication using a plurality of wireless communication media, and is provided above the data link layer in the wireless communication media and used in units of IP packets or data link layer packets. Data link layer packet switch means for selecting a communication medium, and control means for controlling the data link layer packet switch means based on the state of each wireless communication medium or the data link layer packet switch means Features.

  In the wireless device according to the present invention, the control means selects a wireless communication medium to be used by the own wireless device from among available wireless communication media candidates selected for each wireless base station. To do.

  In the radio apparatus according to the present invention, the control means performs control based on communication quality for each radio terminal, presence information of the radio terminal, usage status for each radio module, or list of subordinate radio terminals for each radio module. It is characterized by that.

  The radio apparatus according to the present invention includes one or a plurality of radio modules provided corresponding to each of the radio communication media, and the data link layer packet switch means includes a buffer for storing a packet to be output to the radio module. It is provided for each wireless module, and the packet in the buffer is discarded and transferred according to an instruction from the control means.

  In the radio apparatus according to the present invention, the data link layer packet switch means outputs a packet unit to a single radio module or outputs the same packet to a plurality of radio modules.

  In the wireless device according to the present invention, in the case of communication of a single connection, the output data module from the data link layer packet switch means is selected in units of data link layer packets, and the received data link layer When the packets are integrated as a single IP flow, and in the case of communication of multiple connections, the output radio module from the data link layer packet switch means is selected in units of IP packets, and the received data link layer packet Are integrated in units of IP flows.

  According to the present invention, it is possible to select and use an appropriate wireless communication medium according to a change in the communication environment of each of a plurality of wireless communication media. In addition, it is possible to realize effective use of frequency and securing QoS as the entire wireless communication system.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
FIG. 1 is a block diagram showing an overall configuration of a wireless communication system according to the first embodiment of the present invention. In FIG. 1, a radio base station 1 and a radio terminal 2 correspond to a plurality of radio communication media. In the example of FIG. 1, four wireless communication media A, B, C, and D are supported, and wireless base stations are connected by the wireless connections 101A, 101B, 101C, and 101D of the wireless communication media A, B, C, and D. Wireless communication between 1 and the wireless terminal 2 is possible. The radio base station 1 is connected to the backbone network 3. The backbone network 3 relays communications between the wireless base stations 1 located at various places, and connects communications with external networks (such as the Internet).

  FIG. 2 is a block diagram showing a configuration of the radio base station 1 shown in FIG. FIG. 3 is a block diagram showing a configuration of the wireless terminal 2 shown in FIG. 2 and 3, the same reference numerals are assigned to the corresponding parts.

  The wireless base station 1 and the wireless terminal 2 include wireless modules 11A, 11B, 11C, and 11D of wireless communication media A, B, C, and D, a packet switch 12, a control unit 15, an upper layer unit 16, and a data link. A layer portion 17 and a PHY (physical) layer portion 18 are provided. In addition, the wireless terminal 2 includes an application layer and transport layer processing unit 20. In the following description, unless otherwise limited, each unit will be described without distinguishing between the radio base station 1 and the radio terminal 2.

  The radio modules 11A, 11B, 11C, and 11D (hereinafter referred to as “radio module 11” unless otherwise distinguished) are functions of the PHY layer and the data link layer corresponding to the respective radio communication media A, B, C, and D. Have Examples of functions of the data link layer include MAC (Medium Access Control) and LLC (Logical Link Control). The wireless module 11 transmits and receives data link layer packets to and from the packet switch 12. The wireless module 11 performs wireless transmission and wireless reception of data link layer packets.

  The packet switch 12 has a data link layer packet switching function. The packet switch 12 has a buffer 13 provided corresponding to each wireless module 11. The buffer 13 buffers the data link layer packet transmitted / received to / from the wireless module 11. The packet switch 12 includes a conversion unit 14 that performs mutual conversion between the data link layer packet and the IP packet. The packet switch 12 transmits and receives IP packets to and from the upper layer unit 16.

  The control unit 15 controls the packet switch 12. The upper layer unit 16 has a network control function such as an IP layer or an access network routing layer.

  The radio base station 1 includes a data link layer unit 17 and a PHY layer unit 18 having functions of a data link layer and a PHY layer for connecting to the backbone network 3. In the wireless terminal 2, a processing unit 20 having functions of an application layer and a transport layer, a data link layer unit 17 having a function of a data link layer and a PHY layer for connecting to a wired LAN port, and a PHY layer A portion 18 is provided.

  The packet switch 12 converts the IP packet received from the upper layer unit 16 into a data link layer packet by the conversion unit 14 and outputs the data link layer packet to the wireless module 11 designated by the control unit 15. In the case of single connection communication, the control unit 15 designates the output destination wireless module 11 as the packet switch 12 in units of data link layer packets. On the other hand, in the case of communication with a plurality of connections, the output destination wireless module 11 is designated to the packet switch 12 in units of IP packets. The output destination of one data link layer packet may be one wireless module 11 or a plurality of wireless modules 11. The packet switch 12 has a function of copying and outputting the same data link layer packet to the plurality of wireless modules 11.

  The packet switch 12 converts the data link layer packet received from each wireless module 11 into an IP packet by the conversion unit 14 and outputs the IP packet to the upper layer unit 16.

  Further, the packet switch 12 discards the data link layer packet stored in the buffer 13 in accordance with an instruction from the control unit 15. Further, the packet switch 12 notifies the control unit 15 of the buffering status of each buffer 13.

  At the time of transmission, the wireless module 11 converts the data link layer packet received from the packet switch 12 into a unique format of its own wireless communication medium and wirelessly transmits it. Further, at the time of reception, the data link layer packet of the specific format received wirelessly is converted into a data link layer packet of the common format and output to the packet switch 12.

Further, the wireless module 11 notifies the control unit 15 of various situations of the wireless environment. Examples of the wireless environment status notified to the control unit 15 include the following (a) to (d).
(A) Communication quality for each radio terminal 2 For example, each packet error rate (PER) in the uplink direction (the direction from the radio terminal 2 to the radio base station 1) and in the downlink direction (the direction from the radio base station 1 to the radio terminal 2) Delay time, transmission speed, throughput, and the like.
(B) Presence information of the wireless terminal 2 For example, the position of the wireless terminal 2, the moving speed (including the moving direction), and the like.
(C) Usage status for each wireless module 11 For example, the channel usage rate.
(D) List of subordinate wireless terminals 2 for each wireless module 11 For example, a list of terminals whose presence has been confirmed.

  As a device configuration of the wireless base station 1, the wireless module 11 may be mounted in the device, or the wireless module 11 is extended between the wireless modules 11 using a communication line such as an optical fiber cable, and the wireless module 11 is placed at a plurality of points. It may be distributed.

  The upper layer unit 16 notifies the control unit 15 of information on the input / output IP packet. The IP packet information to be notified includes, for example, address information (destination IP address, transmission source IP address, TCP (Transmission Control Protocol) port address, etc.), connection type (single connection, multiple connections), and communication quality for an IP flow. Request (transmission speed, QoS, etc.). Examples of QoS requests include unconditional priority, delay quality priority, and best effort. A request for communication quality for an IP flow is generated from an application involving IP packet communication, for example. The request content of the communication quality for the IP flow can be known by referring to the “Priority identifier” included in the IP packet. In addition, for each IP address of the wireless terminal 2, a communication quality request content (priority etc.) for the IP flow may be determined in advance.

  The control unit 15 associates the IP flow with the data link layer packet based on the address information notified from the upper layer unit 16. The control unit 15 instructs the packet switch 12 on how to integrate the data link layer packets input from the wireless module 11 based on the connection type notified from the upper layer unit 16. Specifically, in the case of single connection communication, it is instructed to integrate the data link layer packet as a single IP flow, whereas in the case of multiple connection communication, the data link layer packet is IP flow unit. Instruct them to integrate. The packet switch 12 converts the data link layer packet into an IP packet according to the instruction.

  As described above, the control unit 15 receives a notification of the radio environment status from the radio module 11, receives a notification of the buffering status from the packet switch 12, and receives a notification of IP packet information from the upper layer unit 16. The control unit 15 controls the packet switch 12 based on the notified information. Hereinafter, the control operation of the control unit 15 will be described.

  First, regarding the wireless modules 11 included in the wireless base station 1 and the wireless terminal 2, a control operation according to the degree of coincidence of the types of wireless communication media will be described.

[When the wireless communication media type is exactly the same]
The wireless module 11 included in the wireless base station 1 and the wireless module 11 included in the wireless terminal 2 have only the same wireless communication media (there is no wireless module 11 of wireless communication media included in only one of them). ) Is the case. In this case, wireless communication between the wireless base station 1 and the wireless terminal 2 is possible regardless of the wireless module 11 of any wireless communication medium. Thereby, the control part 15 controls the packet switch 12 simply according to a predetermined control policy. An example of the control policy is given below.
Control policy example 1: Select as many wireless modules 11 as necessary to satisfy the transmission rate required by the application. Examples of the selection method include selection at random and selection in a predetermined order.
Control policy example 2: The number of connected terminals is monitored for each wireless module 11, and an empty wireless module 11 is preferentially selected for a packet of an application that emphasizes delay quality.

[When the types of wireless communication media do not match]
This is a case where the wireless module 11 included in the wireless base station 1 and the wireless module 11 included in the wireless terminal 2 have different wireless communication media. In this case, the control unit 15 manages which wireless communication medium the wireless module 11 has as a communication partner. For example, the wireless base station 1 includes a table that records which wireless communication media the wireless module 11 has for each wireless terminal 2. Then, a predetermined control policy (for example, the above control policy examples 1 and 2) is applied to the wireless module 11 of the wireless communication media that both communication parties have.

Next, the control operation according to the communication environment of the radio base station 1 and the radio terminal 2 will be described.
The control unit 15 selects which radio module 11 is used according to the communication environment of the radio base station 1 and the radio terminal 2. When performing this radio | wireless resource control, the control part 15 selects the radio | wireless module 11 to be used with the following procedures (step S11-S14).
Step S11: The wireless module 11 is notified of the wireless environment status, the packet switch 12 is notified of the buffering status, and the upper layer unit 16 is notified of the IP packet information.
Step S12: The movement prediction of the wireless terminal 2, the use prediction of the wireless module 11, and the like are performed from the communication quality, the use status of the wireless module 11, presence information, and the like.
Step S13: The wireless module 11 that can be used for each wireless terminal 2 is determined based on the communication quality, the usage status of the wireless module 11 and the prediction information in step S12, and the available wireless module 11 for each wireless terminal 2 is indicated. Create and update the wireless module management table.
Step S14: At the time of communication of each wireless terminal 2, the wireless module 11 of the output destination of the IP packet input from the upper layer 16 to the packet switch 12 is selected from the wireless module management table, and the packet switch 12 is instructed.
As a result, radio resource control according to changes in the communication environment can be performed.

Next, the control operation according to the communication quality requirement for the IP flow will be described.
The control unit 15 selects which radio module 11 to use in response to a request for communication quality for the IP flow. When performing this radio | wireless resource control, the control part 15 selects the radio | wireless module 11 to be used with the following procedures (steps S21-S24).
Step S21: The wireless module 11 is notified of the wireless environment state, the packet switch 12 is notified of the buffering state, and the upper layer unit 16 is notified of the IP packet information.
Step S22: A wireless module management table indicating the accessible wireless modules 11 for each wireless terminal 2 is created and updated from the list of wireless terminals 2 under each wireless module 11 and presence information.
Step S23: Based on the information notified in step S21 and the wireless module management table, the wireless module 11 that can satisfy the communication quality requirement for the IP flow is determined. Specifically, referring to the usage status (excess bandwidth, expected delay time, throughput, etc.) of the wireless module 11 accessible by the wireless terminal 2, a combination of the wireless modules 11 that can satisfy the required quality is obtained.
Step S24: The packet switch 12 is instructed to the wireless module 11 selected by the judgment in step S23.
Thereby, it is possible to perform radio resource control according to the communication quality requirement for the IP flow.

  The control unit 15 may instruct the packet switch 12 about the wireless module 11 to be used in units of IP packets, or may instruct the wireless module 11 to be used in units of data link layer packets.

  In addition, the control unit 15 may make a table indicating which wireless module 11 should be used, and download the instruction table to the packet switch 12 so as to cover possible cases. In this case, the packet switch 12 determines the output destination wireless module 11 of the data link layer packet according to the instruction table. When there is a change in the instruction table, the control unit 15 updates the instruction table and re-downloads it to the packet switch 12.

  As described above, according to the first embodiment, the data link layer that selects the wireless communication medium to be used in units of IP packets or data link layer packets above the data link layer (MAC, LLC, etc.) in the wireless communication medium. A packet switch is provided. Further, the data link layer packet switch is controlled based on the communication environment of each wireless communication medium and the state of the data link layer packet switch.

  According to the first embodiment, by performing switching in units of packets in the data link layer, it is possible to easily use an appropriate wireless communication medium according to changes in the communication environment of each of a plurality of wireless communication media. . Furthermore, as compared with switching in units of packets in the IP layer, it is possible to select an appropriate wireless module in a timely manner according to changes in the wireless environment. Thereby, the frequency time utilization factor of each wireless module can be improved.

  In addition, by switching in units of packets in the data link layer, functions unique to the wireless communication medium can be concealed in the wireless module. As a result, even if the types of wireless communication media increase, the configuration of the upper layer is not affected, so that the design of the upper layer is facilitated. Further, it is possible to easily cope with the expansion of the wireless module by increasing the number of branches of the packet switch. In addition, the impact on existing wireless modules can be minimized, and individual changes of each wireless module can be flexibly handled.

  Note that the control unit 15 described above may be included in either one of the wireless devices of the wireless base station 1 and the wireless terminal 2, or may be included in both. When the wireless device is provided in either one of the wireless base station 1 and the wireless terminal 2, the wireless communication medium to be used is designated to the wireless device that is not provided from the wireless device that is provided. When both the radio base station 1 and the radio terminal 2 are provided, the radio base station 1 adopts a radio communication media selection by either radio apparatus, but the radio base station 1 comprehensively determines and uses the radio communication media. It is preferable to select media.

[Second Embodiment]
FIG. 4 is a block diagram showing a configuration of a radio communication system according to the second embodiment of the present invention. FIG. 4 shows only the configuration related to the radio base station 1. Also, in FIG. 4, parts corresponding to the respective parts in FIG.

  In the second embodiment, a host control unit 30 shown in FIG. 4 is provided. The host control unit 30 is connected to each radio base station 1 via a communication line. The upper control unit 30 controls each radio base station 1. Hereinafter, differences from the above-described first embodiment will be mainly described.

The upper control unit 30 selects candidates for wireless communication media to be used in each wireless base station 1.
The upper control unit 30 has an interface with the control unit 15 in each radio base station 1. The host control unit 30 receives notifications such as the radio environment status and the buffering status of the packet switch 12 from the control unit 15 in each radio base station 1. Examples of the wireless environment status include (a) communication quality for each wireless terminal 2, (b) presence information of the wireless terminal 2, (c) usage status for each wireless module 11, and (d) subordinates for each wireless module 11. A list of wireless terminals 2 can be given. Based on the information notified from each radio base station 1, the upper control unit 30 selects a radio communication media candidate to be used in each radio base station 1 and notifies the control unit 15 in each radio base station 1.

  Next, the operation of radio resource control according to the second embodiment will be described.

  First, the control operation according to the communication environment of the radio base station 1 and the radio terminal 2 will be described. In the second embodiment, when performing radio resource control according to the communication environment of the radio base station 1 and the radio terminal 2, the radio module 11 to be used is selected in the following procedure (steps S31 to S36).

Step S31: The control unit 15 receives a notification of the wireless environment status from the wireless module 11, receives a notification of the buffering status from the packet switch 12, and receives a notification of IP packet information from the upper layer unit 16. The control unit 15 transmits the notified information to the upper control unit 30.
Step S32: The host control unit 30 performs the movement prediction of the wireless terminal 2, the use prediction of the wireless module 11, and the like based on the communication quality received from each wireless base station 1, the use status and presence information of the wireless module 11, and the like.
Step S33: The host control unit 30 determines the wireless module 11 that can be used by each wireless base station 1 based on the communication quality, the usage status of the wireless module 11 and the prediction information of step S32, and the like. A wireless module candidate list indicating available wireless module 11 candidates is created and updated.
Step S34: The host control unit 30 transmits the corresponding radio module candidate list to the control unit 15 in each radio base station 1.
Step S35: The control unit 15 determines the wireless module 11 that can be used for each wireless terminal 2 based on the wireless module candidate list received from the host control unit 30, and indicates the wireless module 11 that can be used for each wireless terminal 2. Create and update the wireless module management table.
Step S36; At the time of communication of each wireless terminal 2, the control unit 15 selects the wireless module 11 that is the output destination of the IP packet input from the upper layer 16 to the packet switch 12 from the wireless module management table, and instructs the packet switch 12 To do.

  As a result, the wireless module 11 candidate for each wireless base station 1 is selected in consideration of mutual interference between the base stations, so that it is possible to effectively use the frequency of the entire wireless communication system. become. Also, radio resource control can be performed according to changes in the communication environment.

Next, the control operation according to the communication quality requirement for the IP flow will be described. In the second embodiment, when radio resource control is performed in response to a request for communication quality for an IP flow, the following procedure (steps S41 to S4) is performed.
), The wireless module 11 to be used is selected.

Step S41: The control unit 15 receives a notification of the wireless environment status from the wireless module 11, receives a notification of the buffering status from the packet switch 12, and receives a notification of IP packet information from the upper layer unit 16. The control unit 15 transmits the notified information to the upper control unit 30.
Step S42: The host control unit 30 determines the radio module 11 that can be used by each radio base station 1 based on the communication quality received from each radio base station 1, the usage status of the radio module 11, and the like. A wireless module candidate list indicating candidates for available wireless modules 11 is created and updated.
Step S43: The host control unit 30 transmits the corresponding radio module candidate list to the control unit 15 in each radio base station 1.
Step S44: The controller 15 creates and updates a wireless module management table indicating the accessible wireless modules 11 for each wireless terminal 2 from the list of wireless terminals 2 under each wireless module 11, presence information, and the like. Here, the wireless module management table is dynamically updated and recorded in response to notification from the wireless terminal 2, location registration, and the like.
Step S45: The control unit 15 is a radio module that can satisfy the communication quality requirement for the IP flow based on the information notified in step S41, the radio module candidate list received from the host control unit 30, and the radio module management table. 11 is judged. Specifically, reference is made to the wireless module 11 in the wireless module candidate list that can be accessed by the wireless terminal 2 (required bandwidth, expected delay time, throughput, etc.), and the required quality is determined. A combination of wireless modules 11 that can be satisfied is obtained.
Step S46; The packet switch 12 is instructed to the wireless module 11 selected by the judgment in step S45.

  As a result, a candidate for the wireless module 11 that can be used by each wireless base station 1 is selected in consideration of mutual interference between the base stations, and therefore, when using a plurality of wireless communication media and a plurality of base stations. It is possible to secure an integrated QoS.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design changes and the like within a scope not departing from the gist of the present invention.
Moreover, according to the embodiment described above, the following excellent effects can be obtained.
In general, the frequency time utilization rate of each wireless communication medium varies greatly depending on the day of the week, the time zone, and the like, and particularly in a band of 6 GHz or less (VHF, UHF, low microwave band), there is a serious radio wave tight situation. Under such circumstances, according to the present embodiment, it is possible to perform radio resource allocation control by cooperation or integration between wireless communication media according to the radio wave usage status of the wireless communication media. By constructing a wireless communication system that integrates media, it is possible to improve the frequency time utilization rate and contribute to the promotion of effective use of radio waves.

1 is a block diagram showing an overall configuration of a wireless communication system according to a first embodiment of the present invention. It is a block diagram which shows the structure of the wireless base station 1 shown in FIG. It is a block diagram which shows the structure of the radio | wireless terminal 2 shown in FIG. It is a block diagram which shows the structure of the radio | wireless communications system which concerns on 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Wireless base station (wireless device), 2 ... Wireless terminal (wireless device), 11 ... Wireless module, 12 ... Packet switch, 13 ... Buffer, 14 ... Conversion part, 15 ... Control part, 16 ... Upper layer part, 17 ... Data link layer part, 18 ... PHY (physical) layer part, 20 ... Application layer and transport layer processing part, 30 ... Upper control part

Claims (8)

In a wireless communication system that performs wireless communication between a wireless base station and a wireless terminal using a plurality of wireless communication media,
Provided above the data link layer in the wireless communication medium, and provided with data link layer packet switch means for selecting a wireless communication medium to be used in units of IP packets or data link layer packets, respectively, in the wireless base station and the wireless terminal,
Control means for controlling the data link layer packet switch means based on the state of each wireless communication medium or the data link layer packet switch means,
A wireless communication system.   The wireless communication system according to claim 1, wherein the control unit selects a candidate of an available wireless communication medium for each wireless base station. In a wireless device that performs wireless communication using a plurality of wireless communication media,
A data link layer packet switch means for selecting a wireless communication medium to be used in units of IP packets or data link layer packets, provided above the data link layer in the wireless communication medium;
Control means for controlling the data link layer packet switch means based on the state of each wireless communication medium or the data link layer packet switch means;
A wireless device comprising:   4. The radio apparatus according to claim 3, wherein the control unit selects a radio communication medium to be used by the own radio apparatus from among available radio communication media candidates selected for each radio base station. .   The control unit performs control based on communication quality for each wireless terminal, presence information of the wireless terminal, usage status for each wireless module, or a list of subordinate wireless terminals for each wireless module. 4. The wireless device according to 4. Comprising one or more wireless modules provided corresponding to each of the wireless communication media;
The data link layer packet switch means has a buffer for storing a packet to be output to the wireless module for each wireless module, and discards and transfers the packet in the buffer according to an instruction from the control means.
The wireless device according to claim 3, wherein the wireless device is a wireless device.   7. The radio apparatus according to claim 6, wherein the data link layer packet switch means outputs a packet unit to a single radio module or outputs the same packet to a plurality of radio modules. In the case of communication of a single connection, the output radio module from the data link layer packet switch means is selected in units of data link layer packets, and the received data link layer packets are integrated as a single IP flow. And
In the case of communication of a plurality of connections, an output destination radio module from the data link layer packet switch means is selected in units of IP packets, and the received data link layer packets are integrated in units of IP flows.
The wireless device according to claim 7.

Images