JP6197419B2 - Wireless communication system, management apparatus, wireless communication apparatus, communication control method, and communication control program - Google Patents

Description

  The present invention relates to a radio communication system, a management apparatus, a radio communication apparatus, a communication control method, and a communication control program, and more particularly to a radio communication system, a management apparatus, a radio communication apparatus, a communication control method, and a communication that dynamically reconfigures a network. It relates to the control program.

  An M2M (Machine to Machine) system is known as a system that uses communication services such as wireless LAN, LTE, ZigBee (registered trademark), and Bluetooth (registered trademark). In the M2M system, devices equipped with radios send and receive information to each other without human intervention, so that the inventory status of products built in vending machines is automatically reported to the server, etc. The device is automatically controlled.

  As an example of the M2M system, for example, Patent Literature 1 (Japanese Patent No. 4237134) discloses the following technology. That is, a mobile communication network having a wireless terminal, a gateway node capable of wireless communication with the wireless terminal, a location information storage device that holds location information of the wireless terminal, and a message transmission destination from the wireless terminal This is a network system in which another network to which a certain terminal is connected is connected via a gateway. The network system includes terminal address holding means for holding the address of the terminal that is a transmission destination predetermined for each wireless terminal. When transmitting a message from the wireless terminal to the terminal, when the gateway node receives a wireless frame from the wireless terminal, the gateway node accesses the terminal address holding unit, and sends a message destination terminal to each wireless terminal. An address is specified, and a message is transmitted to the specified destination terminal via the gateway. When transmitting a message from the terminal to the wireless terminal, the gateway accesses the position information storage device, acquires position information from the ID of the wireless terminal, and the corresponding gateway node from the acquired position information Forward the message to The gateway node transfers the message to the wireless terminal.

Japanese Patent No. 4237134

"Part11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specification", IEEE 802.11 WG, 2012

  In such an M2M system, when the number of wireless terminal devices increases, collision of wireless signals from each wireless terminal device is likely to occur, and waiting time until transmission for avoiding the collision increases. In such a case, the frequency utilization efficiency in the M2M system is lowered, and the user's feeling of use of the wireless terminal device is lowered.

  This invention was made in order to solve the above-mentioned subject, and the object is a radio communications system which can realize good radio communications between a plurality of radio terminal devices and a plurality of radio base station devices, A management device, a wireless communication device, a communication control method, and a communication control program are provided.

  (1) In order to solve the above-described problem, a radio communication system according to an aspect of the present invention includes one or more radio base station apparatuses and one or more radio terminal apparatuses. Wireless resources used when transmitting and receiving information between wireless base station devices are shared by control information for the wireless terminal device to start communication with the new wireless base station device as a communication connection destination and other information Then, at least one of the radio terminal device and the radio base station device preferentially transmits the control information according to a communication state between the radio terminal device and the radio base station device.

  (6) In order to solve the above-described problem, a management apparatus according to an aspect of the present invention is a management apparatus that manages a radio base station apparatus and a radio terminal apparatus, and is between the radio terminal apparatus and the radio base station apparatus. The wireless resource used when transmitting and receiving information is shared between the control information for the wireless terminal device to start communication with the new wireless base station device as a communication connection destination, and other information, and A communication unit capable of communicating with the wireless terminal device that is connected to the wireless base station device via the wireless base station device, and at least one of the wireless terminal device and the wireless base station device includes the control unit; The control information and the other information are transmitted according to the priority set for the information and the other information, respectively, and the management device further includes the wireless terminal device and the wireless information Depending on the communication state between Chikyoku device, and a priority control section which sets the priority to the control information and the other information.

  (7) In order to solve the above-described problem, a wireless communication apparatus according to an aspect of the present invention is a wireless communication apparatus, and communicates with another wireless communication apparatus. A communication unit that shares wireless resources used when transmitting / receiving information to / from the device with control information for the wireless terminal device to start communication with the new wireless base station device as a communication connection destination and other information And a communication state acquisition unit that acquires a communication state between the own wireless communication device and the other wireless communication device, the communication unit according to the communication state acquired by the communication state acquisition unit Thus, the control information is preferentially transmitted.

  (8) In order to solve the above problem, a communication control method according to an aspect of the present invention is a communication control method in a radio communication system including one or more radio base station apparatuses and one or more radio terminal apparatuses. The wireless resource used when transmitting / receiving information between the wireless terminal device and the wireless base station device is for the wireless terminal device to start communication using the new wireless base station device as a communication connection destination. The information is shared by the control information and other information, and at least one of the wireless terminal device and the wireless base station device acquires a communication state between the wireless terminal device and the wireless base station device; At least one of the wireless terminal device and the wireless base station device transmits the control information preferentially according to the acquired communication state. Tsu and a flop.

  (9) In order to solve the above-described problem, a communication control program according to an aspect of the present invention is a communication control program used in a management apparatus that manages a radio base station apparatus and a radio terminal apparatus, and the radio terminal apparatus And the radio resource used when transmitting / receiving information between the radio base station apparatuses includes control information for the radio terminal apparatus to start communication with the new radio base station apparatus as a communication connection destination, other information, And at least one of the wireless terminal device and the wireless base station device transmits the control information and the other information according to the priority set in the control information and the other information, respectively. And acquiring, in a computer, a communication state between the wireless terminal device and the wireless base station device, and the acquired communication state. Flip and a program for executing a step of setting a priority to the control information and the other information.

  (10) In order to solve the above-described problem, a communication control program according to another aspect of the present invention is a communication control program used in a wireless communication device, and the computer communicates with its own wireless communication device and other wireless communication devices. A step of acquiring a communication state with the device, and communicating with the other wireless communication device, and transmitting and receiving information between the self wireless communication device and the other wireless communication device. The wireless terminal device is a program for executing control information for starting communication with a new wireless base station device as a communication connection destination and a step shared by other information, and the other wireless communication device In the step of communicating with the control information, the control information is preferentially transmitted according to the acquired communication state.

  According to the present invention, it is possible to realize good radio communication between a plurality of radio terminal apparatuses and a plurality of radio base station apparatuses.

FIG. 1 is a diagram showing a configuration of a radio communication system according to an embodiment of the present invention. FIG. 2 is a diagram illustrating an example of control information transmitted and received in the wireless communication system according to the embodiment of the present invention. FIG. 3 is a diagram showing an example of the software configuration and management control of each device in the wireless communication system according to the embodiment of the present invention. FIG. 4 is a diagram showing an example of packet transmission timing in the wireless communication system according to the embodiment of the present invention. FIG. 5 is a diagram showing a configuration of the management apparatus in the wireless communication system according to the embodiment of the present invention. FIG. 6 is a diagram showing a configuration of a radio terminal apparatus in the radio communication system according to the embodiment of the present invention. FIG. 7 is a diagram showing a configuration of an access point in the radio communication system according to the embodiment of the present invention. FIG. 8 is a diagram showing an outline of a control procedure for network reconfiguration in the radio communication system according to the embodiment of the present invention. FIG. 9 is a diagram showing an example of a sequence of network reconfiguration when the management apparatus takes the initiative in setting information priorities in the wireless communication system according to the embodiment of the present invention. FIG. 10 is a diagram illustrating an example of a sequence of network reconfiguration when the wireless terminal device takes the initiative in setting information priorities in the wireless communication system according to the embodiment of the present invention. FIG. 11 is a diagram showing an outline of simulation modeling the network reconfiguration processing in the radio communication system according to the embodiment of the present invention. FIG. 12 is a diagram illustrating an example of parameters used in the simulation illustrated in FIG. FIG. 13 is a diagram illustrating an example of a temporal change in throughput in the wireless terminal device obtained by the simulation illustrated in FIG. 11. FIG. 14 is a diagram illustrating another example of the temporal change in throughput in the wireless terminal device obtained by the simulation illustrated in FIG. 11. FIG. 15 is a diagram illustrating an example of a temporal change in the total QoE of 100 wireless terminal devices obtained by the simulation illustrated in FIG.

  First, the contents of the embodiment of the present invention will be listed and described.

  (1) A radio communication system according to an embodiment of the present invention includes one or a plurality of radio base station apparatuses and one or a plurality of radio terminal apparatuses, and information is transmitted between the radio terminal apparatuses and the radio base station apparatuses. The wireless resource used when transmitting / receiving is shared by control information for the wireless terminal apparatus to start communication with the new wireless base station apparatus as a communication connection destination and other information, and the wireless terminal At least one of the apparatus and the radio base station apparatus preferentially transmits the control information according to a communication state between the radio terminal apparatus and the radio base station apparatus.

  With such a configuration, for example, even if the number of wireless terminal devices in a wireless communication system increases and a state in which a radio signal from each wireless terminal device collides occurs, control information is generated according to the occurrence of the state. Since it is transmitted preferentially, the wireless terminal device can quickly establish a communication connection with a new wireless base station device.

  As a result, it is possible to reduce the waiting time until transmission for avoiding collision of radio signals from each radio terminal apparatus, so that the frequency use efficiency in the radio communication system can be improved and the user of the radio terminal apparatus can be improved. The deterioration of the feeling of use can be suppressed. That is, good wireless communication can be realized between a plurality of wireless terminal devices and a plurality of wireless base station devices.

  (2) Preferably, the said radio | wireless communications system is further equipped with the management apparatus which manages the said radio base station apparatus and the said radio | wireless terminal apparatus, and the said radio | wireless terminal apparatus is via the said radio base station apparatus of a communication connection destination. It is possible to communicate with the management apparatus, and at least one of the radio terminal apparatus and the radio base station apparatus follows the control information and the other information according to the priority set in the control information and the other information, respectively. Information is transmitted, and at least one of the management device and the wireless terminal device sets a priority for the control information and the other information according to the communication state.

  With such a configuration, the priority of control information and other information can be dynamically set according to the communication state in communication between the wireless terminal device and the wireless base station device. Efficiency can be improved.

  In addition, since the management device can comprehensively determine the communication state between each wireless terminal device and each wireless base station device in the wireless communication system, the priority of control information and other information should be set appropriately. Can do.

  (3) More preferably, at least one of the management device and the wireless terminal device is configured such that when the communication state deteriorates, the priority of the control information is higher than the priority of the other information. Priorities of the control information and the other information are set.

  With such a configuration, control information is transmitted preferentially over other information in a situation where the network including the wireless terminal device and the wireless base station device needs to be reconfigured, so that the network can be reconfigured smoothly. , Communication state can be improved.

  (4) Preferably, communication between the radio terminal apparatus and the radio base station apparatus is performed in a state where at least one of the radio terminal apparatus and the radio base station apparatus is transmitting the control information preferentially. When the state satisfies a predetermined condition, the control information is preferentially transmitted and the other information is preferentially transmitted.

  With such a configuration, for example, when the communication state is improved, other information is transmitted preferentially over the control information between the wireless terminal device and the wireless base station device, so appropriate priority control according to the communication state is performed. It can be carried out.

  (5) Preferably, at least one of the wireless terminal device and the wireless base station device is configured according to at least one of communication traffic and communication quality between the wireless terminal device and the wireless base station device. Send control information preferentially.

  With such a configuration, it is possible to appropriately determine the communication state according to communication traffic or communication quality, and to preferentially transmit control information.

  (6) A management apparatus according to an embodiment of the present invention is a management apparatus that manages a radio base station apparatus and a radio terminal apparatus, and transmits and receives information between the radio terminal apparatus and the radio base station apparatus. The radio resource to be used is shared by the control information for the radio terminal apparatus to start communication with the new radio base station apparatus as a communication connection destination and other information, and via the radio base station apparatus A communication unit that is communicably connected to the wireless terminal device connected to the wireless base station device, and at least one of the wireless terminal device and the wireless base station device includes the control information and the other information. According to the set priority, the control information and the other information are transmitted, and the management device further responds to a communication state between the wireless terminal device and the wireless base station device. , And a priority control unit for setting a priority to the control information and the other information.

  With such a configuration, the priority of control information and other information can be dynamically set according to the communication state in communication between the wireless terminal device and the wireless base station device. Communication efficiency in a wireless communication system including the device and the wireless terminal device can be improved.

  As a result, it is possible to reduce the waiting time until transmission for avoiding collision of radio signals from each radio terminal apparatus, so that the frequency use efficiency in the radio communication system can be improved and the user of the radio terminal apparatus can be improved. The deterioration of the feeling of use can be suppressed. That is, good wireless communication can be realized between a plurality of wireless terminal devices and a plurality of wireless base station devices.

  In addition, since the management apparatus can comprehensively determine the communication state between each wireless terminal apparatus and each wireless base station apparatus in the wireless communication system, the priority of control information and other information is set appropriately. be able to.

  (7) A wireless communication apparatus according to an embodiment of the present invention is a wireless communication apparatus, communicates with another wireless communication apparatus, and transmits information between the own wireless communication apparatus and the other wireless communication apparatus. The wireless resource used for transmission / reception is shared between the control information for the wireless terminal device to start communication with the new wireless base station device as a communication connection destination, and other information, and the own wireless communication device And a communication state acquisition unit that acquires a communication state between the wireless communication device and the other wireless communication device, wherein the communication unit prioritizes the control information according to the communication state acquired by the communication state acquisition unit. To send.

  With such a configuration, for example, in a wireless communication system configured by a wireless base station device and a wireless terminal device, the number of wireless terminal devices increases, and a state in which a collision of wireless signals from each wireless terminal device occurs occurs. However, since the control information is preferentially transmitted according to the occurrence of the state, the wireless terminal device can quickly establish a communication connection with a new wireless base station device.

  As a result, it is possible to reduce the waiting time until transmission for avoiding collision of radio signals from each radio terminal device, so that the frequency utilization efficiency in the radio communication system can be improved, and the radio terminal device It is possible to suppress a decrease in the user's feeling of use. That is, good wireless communication can be realized between a plurality of wireless terminal devices and a plurality of wireless base station devices.

  (8) A communication control method according to an embodiment of the present invention is a communication control method in a radio communication system including one or more radio base station apparatuses and one or more radio terminal apparatuses, and the radio terminal Radio resources used when transmitting and receiving information between the device and the wireless base station device are control information for the wireless terminal device to start communication with the new wireless base station device as a communication connection destination, and other information And at least one of the wireless terminal device and the wireless base station device acquires a communication state between the wireless terminal device and the wireless base station device, the wireless terminal device and the wireless terminal device And at least one of the radio base station apparatuses preferentially transmits the control information according to the acquired communication state.

  With such a configuration, for example, even if the number of wireless terminal devices in a wireless communication system increases and a state in which a radio signal from each wireless terminal device collides occurs, control information is generated according to the occurrence of the state. Since it is transmitted preferentially, the wireless terminal device can quickly establish a communication connection with a new wireless base station device.

  As a result, it is possible to reduce the waiting time until transmission for avoiding collision of radio signals from each radio terminal apparatus, so that the frequency use efficiency in the radio communication system can be improved and the user of the radio terminal apparatus can be improved. The deterioration of the feeling of use can be suppressed. That is, good wireless communication can be realized between a plurality of wireless terminal devices and a plurality of wireless base station devices.

  (9) A communication control program according to an embodiment of the present invention is a communication control program used in a management apparatus that manages a radio base station apparatus and a radio terminal apparatus, and is between the radio terminal apparatus and the radio base station apparatus. The wireless resource used when transmitting and receiving information is shared between the control information for the wireless terminal device to start communication with the new wireless base station device as a communication connection destination, and other information, and At least one of the radio terminal device and the radio base station device transmits the control information and the other information according to the priority set in the control information and the other information, and transmits the radio information to a computer. Acquiring a communication state between the terminal device and the radio base station device, and depending on the acquired communication state, the control information and Is a program for executing the steps of setting a priority to other information.

  With such a configuration, the priority of control information and other information can be dynamically set according to the communication state in communication between the wireless terminal device and the wireless base station device. Communication efficiency in a wireless communication system including the device and the wireless terminal device can be improved.

  As a result, it is possible to reduce the waiting time until transmission for avoiding collision of radio signals from each radio terminal apparatus, so that the frequency use efficiency in the radio communication system can be improved and the user of the radio terminal apparatus can be improved. The deterioration of the feeling of use can be suppressed. That is, good wireless communication can be realized between a plurality of wireless terminal devices and a plurality of wireless base station devices.

  In addition, since the management apparatus can comprehensively determine the communication state between each wireless terminal apparatus and each wireless base station apparatus in the wireless communication system, the priority of control information and other information is set appropriately. be able to.

  (10) A communication control program according to an embodiment of the present invention is a communication control program used in a wireless communication device, and indicates a communication state between its own wireless communication device and another wireless communication device to a computer. The wireless terminal device uses the new step to acquire the wireless resource used when communicating with the other wireless communication device and transmitting / receiving information between the own wireless communication device and the other wireless communication device. This is a program for executing control information for starting communication with a base station device as a communication connection destination and a step shared by other information, and acquired in the step of communicating with the other wireless communication device. The control information is preferentially transmitted according to the communication state.

  With such a configuration, for example, in a wireless communication system configured by a wireless base station device and a wireless terminal device, the number of wireless terminal devices increases, and a state in which a collision of wireless signals from each wireless terminal device occurs occurs. However, since the control information is preferentially transmitted according to the occurrence of the state, the wireless terminal device can quickly establish a communication connection with a new wireless base station device.

  As a result, it is possible to reduce the waiting time until transmission for avoiding collision of radio signals from each radio terminal device, so that the frequency utilization efficiency in the radio communication system can be improved, and the radio terminal device It is possible to suppress a decrease in the user's feeling of use. That is, good wireless communication can be realized between a plurality of wireless terminal devices and a plurality of wireless base station devices.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

[Task]
In the 2.4 GHz band, various wireless devices are currently communicating for various purposes. And since each radio | wireless apparatus communicates simultaneously and a signal collides and communication cannot be performed, the CSMA / CA (Carrier Sense Multiple Access / Collision Avoidance) system is generally adopted.

  For example, in a network including an access point and a wireless terminal device, when the number of wireless terminal devices increases, the probability of signal collision increases, and the standby time until transmission for avoiding the collision increases. For this reason, for example, it becomes difficult for the wireless terminal device to transmit control information for starting communication with a new access point as a communication connection destination, so that it becomes difficult to quickly control reconfiguration of the network. Thereby, for example, the frequency utilization efficiency of the 2.4 GHz band is lowered, and the user's feeling of use of the wireless terminal device is lowered.

  Further, for example, in wireless communication used for mobile phones and the like, loss of control information is suppressed by providing a channel for control information and a channel for information other than control information separately. However, there is a problem that information exchange for securing a control information channel is newly required.

  Therefore, the wireless communication system according to the embodiment of the present invention solves such problems by the following configuration and operation.

  Specifically, for example, a mechanism for centrally managing widely used wireless LAN devices among wireless devices using the 2.4 GHz band is provided. A management device is installed as a management mechanism, and an application for management control is installed in the wireless LAN terminal. Then, the management device collects information such as the MAC layer / PHY layer of the wireless LAN terminal and the sensor, and controls communication parameters and the like based on the user's feeling of use.

[Configuration and basic operation]
FIG. 1 is a diagram showing a configuration of a radio communication system according to an embodiment of the present invention.

  Referring to FIG. 1, a wireless communication system 401 includes a wireless LAN system standardized by, for example, IEEE 802.11. The wireless communication system 401 includes a management device 101, one or more access points (wireless base station device and wireless communication device: “wireless LAN AP” shown in FIG. 1) 102, and one or more wireless terminal devices (wireless communication). Device) 202.

  Although FIG. 1 representatively shows three access points 102 and two wireless terminal devices 202 under each access point 102, the wireless communication system 401 has a small number or even more access points 102. Alternatively, the wireless terminal device 202 may be provided. In addition, the management apparatus 101 may be integrated with any access point 102 in the wireless communication system 401.

  The wireless communication system 401 is used for distribution management and merchandise management, electronic medical record, quality control, and window guidance in commercial facilities such as shopping malls, hospitals, factories and construction sites, and government offices, respectively.

  The management device 101 communicates with the access point 102 and the wireless terminal device 202 and manages the access point 102 and the wireless terminal device 202.

  The management apparatus 101 and the access point 102 are wired or wirelessly connected and communicate with each other in accordance with, for example, the Ethernet (registered trademark) standard.

  The access point 102 and the wireless terminal device 202 communicate with each other, for example, according to a wireless LAN system. The wireless terminal device 202 can communicate with the management device 101 via the access point 102. In addition, the wireless terminal device 202 can communicate by selecting any one of the plurality of access points 102.

  More specifically, the access point 102 performs wireless communication with one or more wireless terminal devices 202 by transmitting and receiving, for example, a 2.4 GHz band wireless signal.

  The wireless terminal device 202 adopts, for example, the CSMA / CA method, determines whether or not the other wireless terminal devices 202 are transmitting wireless signals, and the other wireless terminal devices 202 are not transmitting wireless signals. If it is determined, a radio signal including information to be transmitted is transmitted to the access point 102.

  For example, control information for the wireless terminal device 202 to start communication with the new access point 102 as a communication connection destination and data information other than the control information between the management device 101, the access point 102, and the wireless terminal device 202 Are sent and received.

  FIG. 2 is a diagram illustrating an example of control information transmitted and received in the wireless communication system according to the embodiment of the present invention.

  Referring to FIG. 2, “registration request” and “response to registration request” are control information transmitted and received between management apparatus 101 and wireless terminal apparatus 202 and used for registration of wireless terminal apparatus 202.

  The “communication information transmission request” and “communication information” are transmitted and received between the management apparatus 101 and the wireless terminal apparatus 202 or the access point 102, and are used for collecting communication states between the access point 102 and the wireless terminal apparatus 202. Control information.

  The “communication information” is, for example, received signal strength indicator (RSSI) that is a received signal strength measured at the access point 102 or the wireless terminal device 202, and transmitted / received per unit time at the access point 102 or the wireless terminal device 202. The throughput, which is the amount of information, is included.

  The “network reconfiguration request” and “response to the network reconfiguration request” are transmitted and received between the management apparatus 101 and the wireless terminal apparatus 202, and the connection relationship between each wireless terminal apparatus 202 and each access point 102 is changed. This is control information used for changing the topology of the network including the point 102 and the wireless terminal device 202.

  The “DHCP control message (DHCP DISCOVER, DHCP REQUEST)” and “DHCP control message (DHCP OFFER, DHCP ACK)” are, for example, between the management apparatus 101 having a DHCP server function and the wireless terminal apparatus 202 having a DHCP client function. The control information is used for automatically assigning an IP address to the wireless terminal device 202.

  The “authentication related message” is, for example, control information that is transmitted and received between the management apparatus 101 having a function of an authentication server and the wireless terminal apparatus 202 and used for authentication of the wireless terminal apparatus 202 that is to be connected to the network.

  FIG. 3 is a diagram showing an example of the software configuration and management control of each device in the wireless communication system according to the embodiment of the present invention.

[Management device]
With reference to FIG. 3, the management apparatus 101 includes a communication unit 10, an application 11, and a database 16. The communication unit 10 includes a TCP processing unit 12, an IP processing unit 13, an Ether MAC processing unit 14, and an Ether PHY processing unit 15. Note that the application 11 may include a plurality of applications, for example.

  The management apparatus 101 operates according to a protocol having a plurality of hierarchized layers. In the management apparatus 101, the application 11 manages and controls the wireless terminal apparatus 202 by performing application layer processing.

  In the management apparatus 101, the TCP processing unit 12 performs processing of a TCP layer lower than the application layer. The IP processing unit 13 performs processing of an IP layer lower than the TCP layer. The Ether MAC processing unit 14 performs processing of a MAC layer lower than the IP layer. The Ether PHY processing unit 15 performs processing of a PHY layer lower than the MAC layer.

  The communication unit 10 receives a communication signal from the access point 102, receives a communication signal from the wireless terminal device 202 via the access point 102, converts the received communication signal into an IP frame, and outputs the IP frame to the application 11.

  The application 11 acquires control information such as “response to registration request” from the IP frame received from the communication unit 10 and registers it in the database 16, for example.

  Then, the application 11 creates control information such as “communication information transmission request” and “network reconfiguration request” based on the acquired control information, and outputs the created control information to the communication unit 10.

  The communication unit 10 transmits the control information received from the application 11 to the access point 102 and transmits to the wireless terminal device 202 via the access point 102.

  The application 11 changes the communication operation of the wireless terminal device 202 by transmitting a “network reconfiguration request” to the wireless terminal device 202. For example, the application 11 changes the topology of the network including the access point 102 and the wireless terminal device 202.

  For example, the application 11 determines whether or not to switch the access point 102 to which the wireless terminal device 202 is communicatively connected based on the value of a function having RSSI and throughput measured at the access point 102 and the wireless terminal device 202 as variables. Judgment is made.

[Wireless terminal device]
The wireless terminal device 202 includes a communication unit 30, an application 31, a sensor 36, and an actuator 37. The communication unit 30 includes a TCP processing unit 32, an IP processing unit 33, a wireless LAN MAC processing unit 34, and a wireless LAN PHY processing unit 35. The application 31 may include a plurality of applications, for example.

  The wireless terminal device 202 operates according to a protocol having a plurality of hierarchized layers.

  Specifically, the sensor 36 is a temperature sensor. The sensor 36 may be, for example, an acceleration sensor or a vibration sensor. Specifically, the actuator 37 is a radiator valve driving device used for air conditioning. The actuator 37 may be a robot arm used in a production line, for example.

  The application 31 performs application layer processing. For example, the application 31 acquires information indicating the state of the wireless terminal device 202 from the wireless LAN MAC processing unit 34 or the wireless LAN PHY processing unit 35. The application 31 acquires temperature information from the sensor 36, for example.

  The TCP processing unit 32 performs processing of a TCP layer lower than the application layer. The IP processing unit 33 performs processing of an IP layer lower than the TCP layer. The wireless LAN MAC processing unit 34 performs processing of a MAC layer lower than the IP layer. The wireless LAN PHY processing unit 35 performs processing of a PHY layer lower than the MAC layer.

  For example, the wireless LAN MAC processing unit 34 or the wireless LAN PHY processing unit 35 measures communication traffic in its own wireless terminal device 202 and communication quality in its own wireless terminal device 202.

  Specifically, the wireless LAN MAC processing unit 34 or the wireless LAN PHY processing unit 35, for example, the packet loss rate received by the wireless terminal device 202, the number of retransmissions of packets transmitted by the wireless terminal device 202, In addition, the communication traffic such as the throughput in the wireless terminal device 202 is measured.

  Further, the wireless LAN MAC processing unit 34 or the wireless LAN PHY processing unit 35 measures communication quality such as reception strength of a wireless signal received by the wireless terminal device 202 of itself. Then, the wireless LAN MAC processing unit 34 or the wireless LAN PHY processing unit 35 outputs measurement information indicating a measurement result to the application 31, for example.

  For example, when the application 31 receives measurement information from the wireless LAN MAC processing unit 34 or the wireless LAN PHY processing unit 35, the application 31 generates communication information from the received measurement information.

  Specifically, the application 31 generates communication information including, for example, at least one of RSSI calculated from the packet loss rate, the number of packet retransmissions, the throughput, and the reception strength. For example, the application 31 outputs the generated communication information to the communication unit 30 as control information. The communication unit 30 transmits the control information received from the application 31 to the management apparatus 101 via the access point 102.

  For example, the application 31 generates temperature information from the temperature measured by the sensor 36 and outputs the generated temperature information to the communication unit 30 as data information. The communication unit 30 transmits data information received from the application 31 to the management apparatus 101 via the access point 102.

  Further, for example, the application 31 receives information for operating the actuator 37 as data information from the management apparatus 101 via the access point 102 and the communication unit 30, and outputs the received information to the actuator 37.

  Further, for example, the application 31 sets the priority of the control information and the data information when transmitting the control information and the data information to the management apparatus 101. Specifically, the application 31 sets the priority of control information and data information in accordance with, for example, the EDCA (Enhanced Distributed Channel Access) standardized by IEEE802.11e shown in Non-Patent Document 1.

  More specifically, for example, the application 31 includes control information and data information in an IP packet and transmits the packet to the management apparatus 101. At this time, the application 31 stores a value indicating the priority of control information or data information included in the IP packet as an access category in the header of the IP packet.

  The value of the access category is, for example, an integer of 3, 2, 1 and 0 in descending order of priority. For example, when the application 31 includes a plurality of applications, the value of the access category may be set for each application.

  For example, the application 31 outputs an IP packet having an access category value corresponding to the priority of control information or data information to the communication unit 30.

  FIG. 4 is a diagram showing an example of packet transmission timing in the wireless communication system according to the embodiment of the present invention.

  Referring to FIG. 4, when communication unit 30 receives an IP packet from application 31, communication unit 30 sets the transmission timing of the IP packet according to the EDCA method according to the value of the access category stored in the header of the received IP packet. adjust.

  Specifically, the communication unit 30 monitors whether another wireless terminal device 202 or the access point 102 is in a busy state where a wireless signal is being transmitted. The communication unit 30 stands by during the busy state.

  When the busy state ends, the communication unit 30 waits until an AIFS (Arbitration Inter-Frame Spacing) time AT elapses. Here, the AIFS time AT differs in length according to the value of the access category included in the IP packet scheduled to be transmitted. Specifically, a short AIFS time AT is assigned to an IP packet having a large access category value, and a long AIFS time AT is assigned to an IP packet having a small access category value.

  The communication unit 30 further waits until the random time RT elapses after the AIFS time AT elapses. Here, the random time RT is a time obtained by multiplying a random number calculated from a range from zero to a certain upper limit value by the slot time ST. The upper limit value is calculated according to the access category value of the IP packet scheduled to be transmitted. Specifically, a small upper limit value is assigned to an IP packet having a large access category value, and a large upper limit value is assigned to an IP packet having a small access category value.

  Then, when the other wireless terminal device 202 or the access point 102 does not transmit a wireless signal while waiting for the total time of the time AT and the time RT, the communication unit 30 starts from the application A that has completed standby first. The received IP packet, that is, an IP packet having an access category value of 3 is transmitted. While an IP packet with an access category value of 3 is being transmitted, IP packets with an access category value of 2, 1, and zero are not transmitted.

  That is, the larger the access category value of the IP packet scheduled to be transmitted, the higher the possibility that the total time of the AIFS time AT and the random time RT will be shorter. As a result, as the value of the access category stored in the header of the IP packet scheduled to be transmitted is increased, the possibility that the IP packet obtains a transmission opportunity can be increased. In other words, in the wireless terminal device 202, an IP packet including control information or data information having a high priority is transmitted in preference to an IP packet including control information or data information having a low priority.

[access point]
Referring to FIG. 3 again, the access point 102 includes a communication unit 20 and an application 27. The communication unit 20 includes a TCP processing unit 21, an IP processing unit 22, an Ether MAC processing unit 23, an Ether PHY processing unit 24, a wireless LAN MAC processing unit 25, and a wireless LAN PHY processing unit 26. The application 27 may include a plurality of applications, for example.

  The access point 102 operates according to a protocol having a plurality of layered layers.

  The application 27 performs application layer processing. For example, the application 27 acquires information indicating the state of the access point 102 from the wireless LAN MAC processing unit 25 or the wireless LAN PHY processing unit 26.

  The TCP processing unit 21 performs TCP layer processing. The IP processing unit 22 performs processing of an IP layer lower than the TCP layer. The Ether MAC processing unit 23 is for communication with the management apparatus 101, and performs processing of an Ethernet (registered trademark) MAC layer lower than the IP layer. The Ether PHY processing unit 24 is for communication with the management apparatus 101, and performs processing of the Ethernet (registered trademark) PHY layer lower than the Ethernet (registered trademark) MAC layer.

  The wireless LAN MAC processing unit 25 is for communication with the wireless terminal device 202, and performs processing of a wireless LAN MAC layer lower than the IP layer. The wireless LAN PHY processing unit 26 is for communication with the wireless terminal device 202, and performs processing of a wireless LAN PHY layer lower than the wireless LAN MAC layer.

  For example, the wireless LAN MAC processing unit 25 or the wireless LAN PHY processing unit 26 measures communication traffic at its own access point 102 and communication quality at its own access point 102.

  Specifically, the wireless LAN MAC processing unit 25 or the wireless LAN PHY processing unit 26, for example, determines the loss rate of packets received by its own access point 102, the number of retransmissions of packets transmitted by its own access point 102, and the self The communication traffic such as the throughput at the access point 102 is measured.

  Further, the wireless LAN MAC processing unit 25 or the wireless LAN PHY processing unit 26 measures communication quality such as reception strength of a wireless signal received by the access point 102 of itself. Then, the wireless LAN MAC processing unit 25 or the wireless LAN PHY processing unit 26 outputs, for example, measurement information indicating a measurement result to the application 27.

  For example, when the application 27 receives measurement information from the wireless LAN MAC processing unit 25 or the wireless LAN PHY processing unit 26, the application 27 generates communication information from the received measurement information.

  Specifically, for example, the application 27 generates communication information including at least one of RSSI calculated from the packet loss rate, the number of packet retransmissions, the throughput, and the reception strength. For example, the application 27 outputs the generated communication information to the communication unit 20 as control information. When receiving the control information from the application 27, the communication unit 20 transmits the received control information to the management apparatus 101.

  The communication unit 20 also relays IP packets transmitted and received between the management device 101 and the wireless terminal device 202. More specifically, when the communication unit 20 receives an IP packet from the management apparatus 101, according to the EDCA method shown in FIG. 4, the communication unit 20 transmits the IP packet at a transmission timing corresponding to the value of the access category stored in the header of the IP packet Is transmitted to the wireless terminal device 202.

  Thereby, in the access point 102, an IP packet including control information or data information having a high priority is transmitted in preference to an IP packet including control information or data information having a low priority.

[Configuration of management device]
FIG. 5 is a diagram showing a configuration of the management apparatus in the wireless communication system according to the embodiment of the present invention.

  Referring to FIG. 5, the management apparatus 101 includes a communication unit 10, a communication state acquisition unit 18, a priority control unit 19, a reception unit 51, a transmission unit 52, a data information acquisition unit 55, and data information. And a processing unit 56. The communication state acquisition unit 18 includes a communication state extraction unit 53 and a communication state determination unit 54. The communication state acquisition unit 18, the priority control unit 19, the data information acquisition unit 55, and the data information processing unit 56 correspond to part or all of the application 11.

  The transmission unit 52 converts the control information or data information received from the communication unit 10 into, for example, an optical signal and transmits it to the access point 102.

  The receiving unit 51 receives, for example, an optical signal from the access point 102, converts the received signal into an IP frame including control information and data information, and outputs the IP frame to the communication unit 10.

  For example, the communication unit 10 communicates with the access point 102 and also communicates with the wireless terminal device 202 connected to the access point 102 via the access point 102.

  For example, the communication state acquisition unit 18 acquires the communication state between the access point 102 and the wireless terminal device 202 from the control information received from the wireless terminal device 202 via the access point 102 and the communication unit 10. In addition, the communication state acquisition unit 18 acquires the communication state between the access point 102 and the wireless terminal device 202 from the control information received from the access point 102 via the communication unit 10, for example.

  Specifically, the communication state extraction unit 53 in the communication state acquisition unit 18 uses, for example, at least one of communication traffic and communication quality included in the control information received from the wireless terminal device 202 as a communication state from the communication unit 10. Extract. The communication state extraction unit 53 outputs the extracted communication state to the communication state determination unit 54.

  For example, when at least one of communication traffic and communication quality in the wireless terminal device 202 is reduced, the communication state determination unit 54 determines that the level of the communication state received from the communication state extraction unit 53 is low.

  Further, the communication state extraction unit 53 extracts, from the communication unit 10, for example, the value of the access category stored in the header of the IP packet received from the wireless terminal device 202. The communication state extraction unit 53 outputs the extracted access category value to the communication state determination unit 54.

  Communication state determination unit 54 determines the level of the communication state based on the value of the access category received from communication state extraction unit 53. More specifically, the communication state determination unit 54, for example, when the value of the access category stored in the header of the IP packet including the control information is greater than the value of the access category stored in the header of the IP packet including the data information It is determined that the communication state level is low.

  In addition, the communication state extraction unit 53 extracts, for example, at least one of communication traffic and communication quality included in the control information received from the access point 102 as a communication state. The communication state extraction unit 53 outputs the extracted communication state to the communication state determination unit 54.

  For example, when the load at the access point 102 increases, the communication state determination unit 54 determines that the level of the communication state received from the communication state extraction unit 53 is low. The communication state determination unit 54 outputs the determination result of the communication state to the priority control unit 19.

  The data information acquisition unit 55 acquires data information such as temperature information from the wireless terminal device 202 from the communication unit 10, and outputs the acquired temperature information to the data information processing unit 56. The data information processing unit 56 creates data information for remotely operating the actuator 37 in the wireless terminal device 202 based on the temperature information received from the data information acquisition unit 55, and uses the created data information as the priority control unit 19. Output to.

  The priority control unit 19 transmits / receives control information such as network reconfiguration to / from the wireless terminal device 202 and the access point 102 via the communication unit 10, for example.

  Moreover, the priority control part 19 sets the priority of control information and data information according to the judgment result received from the communication status judgment part 54, for example. Then, the priority control unit 19 transmits the control information and data information for which the priority is set to the wireless terminal device 202 via the communication unit 10 and the access point 102.

  Specifically, for example, when the level of the communication state indicated by the determination result received from the communication state determination unit 54 is less than a predetermined level, the priority control unit 19 determines the communication state between the access point 102 and the wireless terminal device 202. It is recognized that has deteriorated, and the following processing is performed.

  That is, for example, the priority control unit 19 sets the priority of the control information and the data information so that the priority of the control information is higher than the priority of the data information. Specifically, the priority control unit 19 sets, for example, the value of the access category stored in the header of the IP packet including the control information transmitted to the wireless terminal device 202 via the access point 102 of the IP packet including the data information. Set a value larger than the value of the access category stored in the header.

  As a result, the control information is transmitted from the access point 102 to the wireless terminal device 202 with higher priority than the data information, so that the network reconfiguration can be performed smoothly and the communication traffic or communication quality of the entire network can be improved.

  For example, the priority control unit 19 sets the value of the access category stored in the header of the IP packet including the control information to be larger than the value of the access category stored in the header of the IP packet including the data information. When the communication state level received from the communication state acquisition unit 18 becomes equal to or higher than a predetermined level, for example, it is recognized that the communication state between the access point 102 and the wireless terminal device 202 has been recovered, and the following processing is performed.

  That is, for example, the priority control unit 19 stops preferential transmission of control information and preferentially transmits data information so that the priority of data information is higher than the priority of control information. Set the priority of control information and data information. Specifically, for example, the priority control unit 19 sets the access category value stored in the header of the IP packet including the data information to be transmitted to the wireless terminal device 202 via the access point 102 to the IP packet including the control information. Set a value larger than the value of the access category stored in the header.

  As a result, in the access point 102, data information is transmitted from the access point 102 to the wireless terminal device 202 with priority over the control information, so that the transmission timing of data information that is not allowed to be delayed, such as audio data and video data, is controlled. Delay due to information can be prevented.

  Therefore, each wireless terminal device 202 in the network including the access point 102 and the wireless terminal device 202 can receive data information such as audio data and video data without delay, so that the user satisfaction of the wireless terminal device 202 can be improved. QoE (Quality Of Experience) to be shown can be improved.

  It should be noted that the reference level that the priority control unit 19 recognizes that the communication state between the access point 102 and the wireless terminal device 202 has deteriorated is the same as the reference level that the communication state has been recovered from. It may be different or different.

[Configuration of wireless terminal device]
FIG. 6 is a diagram showing a configuration of a radio terminal apparatus in the radio communication system according to the embodiment of the present invention.

  Referring to FIG. 6, the wireless terminal device 202 includes a communication unit 30, a sensor 36, an actuator 37, a wireless transmission unit 38, a data information processing unit 39, a wireless reception unit 40, and a communication state acquisition unit 41. And a communication control unit 42 and a data information acquisition unit 45. The communication state acquisition unit 41 includes a communication state extraction unit 43 and a communication state determination unit 44. The data information processing unit 39, the communication state acquisition unit 41, the communication control unit 42, and the data information acquisition unit 45 correspond to part or all of the application 31.

  Since sensor 36 and actuator 37 are the same as sensor 36 and actuator 37 shown in FIG. 3, detailed description will not be repeated.

  The wireless transmission unit 38 converts the control information or data information received from the communication unit 30 into a wireless signal, and transmits the converted wireless signal to the management apparatus 101 via the access point 102.

  The wireless reception unit 40 receives a wireless signal from the management apparatus 101 via the access point 102, converts the received wireless signal into an IP frame or the like including control information or data information, and outputs the converted signal to the communication unit 30.

  The communication unit 30 communicates with the management apparatus 101 via the access point 102, for example. Radio resources used when the communication unit 30 performs radio communication with the access point 102 are shared by, for example, control information and data information.

  Here, the radio resource is specifically a frequency band or channel of a radio signal transmitted / received between the radio terminal apparatus 202 and the access point 102. For example, when an OFDMA (Orthogonal Frequency Division Multiple Access) method is used, the frequency band and transmission period of a radio signal transmitted and received between the wireless terminal device 202 and the access point 102 correspond to a radio resource. For example, when a CDMA (Code Division Multiple Access) method is used, a spreading code used for modulation and demodulation of a radio signal transmitted and received between the radio terminal apparatus 202 and the access point 102 corresponds to a radio resource.

  Further, the wireless resources do not include hardware resources such as a CPU (Central Processing Unit) in the access point 102 and the wireless terminal device 202.

  The data information acquisition unit 45 acquires data information from the management apparatus 101, for example, information for remotely operating the actuator 37 from the communication unit 30, and outputs the acquired data information to the data information processing unit 39.

  The data information processing unit 39 outputs the data information received from the data information acquisition unit 45 to the actuator 37. Actuator 37 operates according to the data information received from data information processing unit 39. For example, the data information processing unit 39 generates temperature information from the temperature measured by the sensor 36 and outputs the generated temperature information to the communication control unit 42 as data information.

  The communication state acquisition unit 41 acquires the communication state between the access point 102 and the wireless terminal device 202 based on at least one of communication traffic and communication quality measured in its own wireless terminal device 202, for example.

  More specifically, the communication state extraction unit 43 in the communication state acquisition unit 41 extracts, for example, at least one of communication traffic and communication quality measured in its own wireless terminal device 202 from the communication unit 30 as a communication state. . The communication state extraction unit 43 outputs the extracted communication state to the communication state determination unit 44 and the communication control unit 42.

  For example, when the measured throughput is low or the RSSI is poor, the communication state determination unit 44 determines that the level of the communication state received from the communication state extraction unit 43 is low.

  In addition, the communication state extraction unit 43 extracts, from the communication unit 30, for example, the value of the access category stored in the header of the IP packet received from the management apparatus 101 via the access point 102 and the communication unit 30. The communication state extraction unit 43 outputs the extracted access category value to the communication state determination unit 44.

  The communication state determination unit 44 determines the level of the communication state between the access point 102 and the wireless terminal device 202 based on the access category value received from the communication state extraction unit 43. More specifically, the communication state determination unit 44, for example, when the value of the access category stored in the header of the IP packet including the control information is greater than the value of the access category stored in the header of the IP packet including the data information It is determined that the communication state level is low. The communication state determination unit 44 outputs the determination result of the communication state to the communication control unit 42.

  The communication control unit 42 acquires control information such as a “network reconfiguration request” and a “communication information transmission request” from the IP frame received from the communication unit 30.

  For example, the communication control unit 42 changes the communication operation of its own wireless terminal device 202 according to the change content of the communication operation indicated by the “network reconfiguration request”. Further, the communication control unit 42 generates communication information including the communication state received from the communication state extraction unit 43 as control information in accordance with, for example, a “communication information transmission request”.

  Further, the communication control unit 42 sets the priority of the generated control information and the data information received from the data information processing unit 39 according to the determination result received from the communication state determination unit 44, for example.

  Specifically, for example, when the communication state level indicated by the determination result received from the communication state determination unit 44 is less than a predetermined level, the communication control unit 42 determines that the communication state between the access point 102 and the wireless terminal device 202 is It recognizes that it has deteriorated and performs the following processing.

  That is, for example, the communication control unit 42 sets the priority of the control information and the data information so that the priority of the control information is higher than the priority of the data information. Specifically, for example, the communication control unit 42 sets the access category value stored in the header of the IP packet including the control information to be transmitted to the management apparatus 101 via the access point 102 in the header of the IP packet including the data information. Set a value larger than the value of the access category to be stored. Then, the communication control unit 42 outputs an IP packet including control information or data information to the communication unit 30.

  The communication unit 30 preferentially transmits control information to the management apparatus 101 via the access point 102 in accordance with the communication state acquired by the communication state acquisition unit 41. Specifically, when the communication unit 30 receives an IP packet from the communication control unit 42, the communication unit 30 adjusts the transmission timing of the IP packet according to the EDCA method according to the value of the access category stored in the header of the received IP packet. To do.

  Since the value of the access category stored in the header of the IP packet including the control information is larger than the value of the access category stored in the header of the IP packet including the data information, the communication unit 30 determines the IP packet including the control information as The IP packet including the data information is transmitted to the management apparatus 101 via the access point 102 with priority.

  Thereby, since the control information is transmitted preferentially over the data information in the wireless terminal device 202, the time required for completing the network reconfiguration or the like can be completed, and communication between the access point 102 and the wireless terminal device 202 can be completed. The situation can be improved quickly.

  Further, for example, when the communication control unit 42 sets the value of the access category stored in the header of the IP packet including the control information to be larger than the value of the access category stored in the header of the IP packet including the data information. When the level of the communication state received from the communication state acquisition unit 41 becomes, for example, a predetermined level or more, it is recognized that the communication state between the access point 102 and the wireless terminal device 202 has been recovered, and the following processing is performed.

  That is, for example, the communication control unit 42 stops the preferential transmission of control information and performs control so that the priority of the data information is higher than the priority of the control information in order to preferentially transmit the data information. Set the priority of information and data information. Specifically, for example, the communication control unit 42 sets the access category value stored in the header of the IP packet including the data information to be transmitted to the management apparatus 101 via the access point 102 in the header of the IP packet including the control information. Set a value larger than the value of the access category to be stored. Then, the communication control unit 42 outputs an IP packet including control information or data information to the communication unit 30.

  Since the value of the access category stored in the header of the IP packet including the data information is larger than the value of the access category stored in the header of the IP packet including the control information, the communication unit 30 determines the IP packet including the data information as The IP packet including the control information is transmitted to the management apparatus 101 via the access point 102 with priority.

  As a result, in the wireless terminal device 202, the data information is transmitted from the wireless terminal device 202 to the access point 102 with priority over the control information. Therefore, for example, data information that is not allowed to be delayed, such as audio data and video data, is transmitted from the control information. Priority can be sent.

  In addition, since an apparatus that receives data information from the wireless terminal apparatus 202 can receive audio data, video data, and the like without delay, QoE in the apparatus can be improved.

  It should be noted that the reference level at which the communication control unit 42 recognizes that the communication state between the access point 102 and the wireless terminal device 202 has deteriorated is the same as the reference level at which the communication state is recovered. May be different or different.

[Access point configuration]
FIG. 7 is a diagram showing a configuration of an access point in the radio communication system according to the embodiment of the present invention.

  Referring to FIG. 7, access point 102 includes communication unit 20, transmission unit 61, reception unit 62, wireless reception unit 63, wireless transmission unit 64, communication state acquisition unit 65, and communication control unit 66. With. The communication state acquisition unit 65 and the communication control unit 66 correspond to part or all of the application 27.

  The transmission unit 61 converts the control information or data information received from the communication unit 20 into, for example, an optical signal, and transmits the optical signal to the management apparatus 101.

  The receiving unit 62 receives, for example, an optical signal from the management apparatus 101, converts the received signal into an IP frame including control information and data information, and outputs the IP frame to the communication unit 20.

  The wireless transmission unit 64 converts control information or data information received from the communication unit 20 into a wireless signal, and transmits the converted wireless signal to the wireless terminal device 202.

  The wireless reception unit 63 receives a wireless signal from the wireless terminal device 202, converts the received wireless signal into an IP frame or the like including control information or data information, and outputs the IP frame to the communication unit 20.

  The communication state acquisition unit 65 acquires the communication state between the access point 102 and the wireless terminal device 202 based on at least one of communication traffic and communication quality measured at its own access point 102, for example.

  More specifically, the communication state acquisition unit 65 extracts, for example, at least one of communication traffic and communication quality measured at its own access point 102 from the communication unit 20 as a communication state. The communication state acquisition unit 65 outputs the extracted communication state to the communication control unit 66.

  The communication control unit 66 acquires control information such as a “communication information transmission request” from the IP frame received from the communication unit 20. The communication control unit 66 generates, for example, communication information including the communication state received from the communication state acquisition unit 65 as control information in accordance with the “communication information transmission request”, and the generated control information is managed via the communication unit 20. 101.

  For example, the communication unit 20 communicates with the management apparatus 101 and wirelessly communicates with the wireless terminal apparatus 202. The radio resource used when the communication unit 20 performs radio communication with the radio terminal device 202 is shared by, for example, control information and data information. The radio resources are the same as the radio resources described in “Configuration of radio terminal apparatus”.

  The communication unit 20 preferentially transmits control information to the wireless terminal device 202 according to the communication state acquired by the communication state acquisition unit 65. Specifically, when the management apparatus 101 receives communication information including the communication state acquired by the communication state acquisition unit 65 from the access point 102, the management device 101 stores an access category stored in the header of the IP packet based on the received communication information. Set the value of. When receiving the IP packet from the management apparatus 101, the communication unit 20 adjusts the transmission timing of the IP packet according to the EDCA method according to the value of the access category stored in the header of the received IP packet.

  When the value of the access category stored in the header of the IP packet including the control information is larger than the value of the access category stored in the header of the IP packet including the data information, the communication unit 20 determines the IP packet including the control information as The data is transmitted to the wireless terminal device 202 with priority over the IP packet including the data information.

  As a result, since the control information is transmitted preferentially over the data information in the access point 102, the time until the network reconfiguration or the like is completed can be completed, and the communication state between the access point 102 and the wireless terminal device 202 can be completed. Can be improved quickly.

  Further, when the value of the access category stored in the header of the IP packet including the data information is larger than the value of the access category stored in the header of the IP packet including the control information, the communication unit 20 determines that the IP packet including the data information Is preferentially transmitted to the wireless terminal device 202 over the IP packet including the control information.

  As a result, in the access point 102, data information is transmitted from the access point 102 to the wireless terminal device 202 with priority over the control information. Therefore, for example, data information that is not allowed to be delayed, such as audio data and video data, takes priority over the control information. Can be sent.

  In addition, since the wireless terminal device 202 can receive audio data, video data, and the like without delay, QoE in the wireless terminal device 202 can be improved.

[Operation]
Next, the operation of each device in the wireless communication system according to the embodiment of the present invention will be described with reference to the drawings.

  Each of management apparatus 101, access point 102, and wireless terminal apparatus 202 reads and executes a program including a part or all of each step of the following sequence from a memory (not shown). These programs can be installed from the outside.

  FIG. 8 is a diagram showing an outline of a control procedure for network reconfiguration in the radio communication system according to the embodiment of the present invention.

  Referring to FIG. 8, first, access point 102A establishes a communication connection with wireless terminal apparatuses 202A, 202B, and 202C. The access point 102C has established a communication connection with the wireless terminal device 202D.

  Next, the management apparatus 101 grasps the state of the network to be managed. Specifically, when the application 11 is activated in an initial state in which the application 11 of the management apparatus 101 is not activated, the management apparatus 101 transmits the wireless terminal apparatuses 202A, 202B, 202C, 202D, “registration request”, and “registration request” The wireless terminal devices 202A, 202B, 202C, 202D are registered by transmitting / receiving “response” (step S1).

  Next, for example, when the communication load at the access point 102A increases, the communication state between the access point 102A and the wireless terminal devices 202A, 202B, 202C deteriorates (step S2).

  Next, the management apparatus 101 acquires the communication state between each wireless terminal apparatus 202 and each access point 102 from the communication information received from the wireless terminal apparatuses 202A, 202B, 202C, 202D and the access points 102A, 102B, 102C ( Step S3).

  Next, the management apparatus 101 determines whether to change the network topology based on the acquired communication state (step S4).

  Next, when determining that the topology is to be changed, the management apparatus 101 sends a “network reconfiguration request” as control information to the wireless terminal apparatuses 202A and 202C located in the vicinity of the access points 102B and 102C, respectively, via the access point 102A. (Step S5).

  Next, when receiving the “network reconfiguration request” from the management apparatus 101, the wireless terminal apparatuses 202A and 202C change the communication connection destination from the access point 102A to the access points 102B and 102C, respectively (step S6).

  Note that in step S2, instead of increasing the communication load at the access point 102A, for example, the access point 102A and the wireless terminal devices 202A, 202B, 202C receive interference waves, which causes the deterioration of the communication state. There is a case.

  In this case, the management apparatus 101 may transmit, for example, control information indicating that the channel is changed to the access point 102A and the wireless terminal apparatuses 202A, 202B, and 202C.

  Hereinafter, the operation of the wireless communication system 401 when the wireless terminal device 202A changes the communication connection destination from the access point 102A to the access point 102B will be described in detail.

[When the management device takes the initiative in setting information priorities]
FIG. 9 is a diagram showing an example of a sequence of network reconfiguration when the management apparatus takes the initiative in setting information priorities in the wireless communication system according to the embodiment of the present invention.

  Referring to FIG. 9, first, wireless terminal apparatus 202A establishes a communication connection with access point 102A. In addition, a situation in which the priority setting in the management apparatus 101 and the wireless terminal apparatus 202A is a setting in which zero and 3 are set as access category values for IP packets including control information and IP packets including data information, respectively. Suppose.

  With this setting, the data information transmitted by the management apparatus 101 is transmitted to the wireless terminal apparatus 202A with priority over the control information at the access point 102A. The wireless terminal device 202A transmits data information to the access point 102A with priority over control information.

  Next, the wireless terminal device 202A periodically measures, for example, at least one of communication traffic and communication quality (step S102).

  Further, the access point 102A periodically measures, for example, at least one of communication traffic and communication quality (step S104).

  Next, the communication load at the access point 102A increases (step S106).

  Next, the wireless terminal device 202A transmits, for example, temperature information from the sensor 36 as data information to the management device 101 via the access point 102A (step S108).

  Next, when receiving the data information from the wireless terminal device 202A, the management device 101 transmits, for example, information for operating the actuator 37 as data information to the wireless terminal device 202A via the access point 102A (step S110).

  Next, the management apparatus 101 transmits a “communication information transmission request” to the wireless terminal apparatus 202A via the access point 102A (step S112).

  Next, when the wireless terminal device 202A receives the “communication information transmission request” from the management device 101, for example, the wireless terminal device 202A accesses the “communication information” including the decreased throughput due to an increase in the communication load at the access point 102A. The message is transmitted to the management apparatus 101 via the point 102A (step S114). Although not shown in FIG. 9, for example, the management apparatus 101 transmits a “communication information transmission request” to the wireless terminal apparatus 202 other than the wireless terminal apparatus 202A, and the wireless terminal apparatus 202 other than the wireless terminal apparatus 202A. Receive "communication information" from

  In addition, the access point 102A periodically transmits “communication information” including the reduced throughput and the like to the management apparatus 101 because the communication load has increased in itself (step S116). Although not shown in FIG. 9, the management apparatus 101 receives “communication information” from the access point 102 other than the access point 102A, for example.

  Next, when the management apparatus 101 receives “communication information” from each wireless terminal apparatus 202 and each access point 102, the communication state between the wireless terminal apparatus 202A and the access point 102A is determined based on the received “communication information”. Recognize comprehensively that it has deteriorated. Then, the management apparatus 101 switches the setting to give 3 and zero as the access category value to the IP packet including the control information and the IP packet including the data information (step S118).

  With this setting, the control information transmitted by the management apparatus 101 is transmitted to the wireless terminal apparatus 202A with priority over the data information at each access point 102.

  Next, the management apparatus 101 comprehensively determines to switch the communication connection destination of the wireless terminal apparatus 202A (step S120), and sends a “network reconfiguration request” including the determination result via the access point 102A to the wireless terminal apparatus 202A. (Step S122). At this time, for example, even when there is data information to be transmitted to each wireless terminal device 202, the access point 102A preferentially transmits a “network reconfiguration request” that is control information to the wireless terminal device 202A.

  Next, since the value of the access category stored in the header of the IP packet including the “network reconfiguration request” received from the management apparatus 101 is 3, the wireless terminal apparatus 202A communicates between itself and the access point 102A. Recognize that the condition has deteriorated. Then, the wireless terminal device 202A switches to a setting in which 3 and zero are assigned as access category values to the IP packet including the control information and the IP packet including the data information, respectively (step S124).

  With this setting, wireless terminal apparatus 202A transmits control information to communication partner access point 102 with priority over data information.

  Next, the wireless terminal device 202A transmits a “response to the network reconfiguration request”, which is a response to the “network reconfiguration request”, to the management device 101 via the access point 102A (step S126).

  Then, the wireless terminal device 202A transmits, as control information, a “disconnection request” for disconnecting the communication connection with the access point 102A to the access point 102A. At this time, the wireless terminal device 202A gives priority to the control information “response to network reconfiguration request” and “disconnect request” to the access point 102A even when there is data information to be transmitted to the access point 102A, for example. (Step S128). Thereby, the communication connection between the access point 102A and the wireless terminal device 202A is disconnected.

  Then, the wireless terminal device 202A performs a search process for the access point 102 as a new communication partner.

  Specifically, the wireless terminal device 202A detects a use channel of one or a plurality of access points 102 existing around the wireless terminal device 202A, and receives a “network reconfiguration request” received from the management device 101 from the detected channels. The channel used by the access point 102B included in is identified. Then, the wireless terminal device 202A determines, as a new communication partner, the access point 102B that uses the identified channel among the one or more access points 102 existing around the wireless terminal device 202A. A communication connection process is performed between the access point 102B and the wireless terminal device 202A, thereby establishing a communication connection between the access point 102B and the wireless terminal device 202A (step S130).

  Next, the wireless terminal device 202A transmits, for example, temperature information from the sensor 36 as data information to the management device 101 via the access point 102B (step S132).

  Next, when receiving data information from the wireless terminal device 202A, the management device 101 transmits, for example, information for operating the actuator 37 to the wireless terminal device 202A via the access point 102B as data information (step S134).

  Next, the management apparatus 101 transmits a “communication information transmission request” to the wireless terminal apparatus 202A via the access point 102B (step S136).

  Next, when receiving the “communication information transmission request” from the management apparatus 101, the wireless terminal device 202A accesses “communication information” including, for example, the throughput recovered by switching the communication connection destination to the access point 102B. The message is transmitted to the management apparatus 101 via the point 102B (step S138). Although not shown in FIG. 9, for example, the management apparatus 101 transmits a “communication information transmission request” to the wireless terminal apparatus 202 other than the wireless terminal apparatus 202A, and the wireless terminal apparatus 202 other than the wireless terminal apparatus 202A. Receive "communication information" from

  Next, when the management apparatus 101 receives “communication information” from each wireless terminal apparatus 202, based on the received “communication information”, the management apparatus 101 determines that the communication state between the wireless terminal apparatus 202A and the access point 102B is good. Recognize. Then, the management apparatus 101 switches to a setting that assigns zero and 3 as access category values to the IP packet including control information and the IP packet including data information, respectively (step S140).

  With this setting, the data information transmitted by the management apparatus 101 is transmitted to the wireless terminal apparatus 202A with priority over the control information at the access point 102B.

  Next, the management apparatus 101 transmits a “communication information transmission request” to the wireless terminal apparatus 202A via the access point 102B (step S142). At this time, the access point 102B preferentially transmits data information to the wireless terminal device 202A even when there is control information to be transmitted to each wireless terminal device 202, for example.

  Next, since the value of the access category stored in the header of the IP packet including the “request for transmission of communication information” received from the management apparatus 101 is zero, the wireless terminal apparatus 202A determines that it is between itself and the access point 102B. Recognize that the communication state is good. Then, the wireless terminal device 202A switches to a setting in which zero and 3 are assigned as access category values to the IP packet including the control information and the IP packet including the data information, respectively (step S144).

  By this setting, the wireless terminal device 202A transmits data information to the access point 102B with priority over the control information.

  Next, the wireless terminal device 202A transmits, for example, temperature information from the sensor 36 as data information to the management device 101 via the access point 102B (step S146). At this time, the wireless terminal device 202A preferentially transmits temperature information, which is data information, to the access point 102B even when there is control information to be transmitted to the access point 102B, for example.

  Next, when receiving data information from the wireless terminal device 202A, the management device 101 transmits, for example, information for operating the actuator 37 as data information to the wireless terminal device 202A via the access point 102B (step S148).

  In step S122, the access point 102A preferentially transmits a “network reconfiguration request” to the wireless terminal device 202A. In addition, in steps S126 and S128, wireless terminal apparatus 202A preferentially transmits “response to network reconfiguration request” and “disconnect request” to access point 102A.

  As a result, the waiting time until control information such as “network reconfiguration request”, “response to network reconfiguration request”, and “disconnect request” is transmitted increases, and the network is not reconfigured. It can be prevented from continuing.

  That is, with the configuration in which the control information is preferentially transmitted, the pipeline apparatus 101 comprehensively determines that the communication connection destination of the wireless terminal apparatus 202A is switched in step S120, and then the wireless terminal apparatus 202A performs step S130. The time until the communication connection destination is switched can be shortened.

[When the wireless terminal device takes the initiative in setting information priorities]
FIG. 10 is a diagram illustrating an example of a sequence of network reconfiguration when the wireless terminal device takes the initiative in setting information priorities in the wireless communication system according to the embodiment of the present invention.

  Referring to FIG. 10, first, wireless terminal apparatus 202A establishes a communication connection with access point 102A. In addition, a situation in which the priority setting in the management apparatus 101 and the wireless terminal apparatus 202A is a setting in which zero and 3 are set as access category values for IP packets including control information and IP packets including data information, respectively. Suppose.

  With this setting, the data information transmitted by the management apparatus 101 is transmitted to the wireless terminal apparatus 202A with priority over the control information at the access point 102A. The wireless terminal device 202A transmits data information to the access point 102A with priority over control information.

  Next, the wireless terminal device 202A periodically measures, for example, at least one of communication traffic and communication quality (step S202).

  The access point 102A periodically measures at least one of communication traffic and communication quality, for example (step S204).

  Next, the communication load at the access point 102A increases (step S206).

  Next, the wireless terminal device 202A transmits, for example, temperature information from the sensor 36 as data information to the management device 101 via the access point 102A (step S208).

  Next, when receiving data information from the wireless terminal device 202A, the management device 101 transmits, for example, information for operating the actuator 37 as data information to the wireless terminal device 202A via the access point 102A (step S210).

  Next, for example, when the communication traffic measurement result indicates a decrease in throughput due to an increase in the communication load at the access point 102A, the wireless terminal device 202A determines that between itself and the access point 102A based on the measurement result. Recognize that the communication status has deteriorated. Then, the wireless terminal device 202A switches to a setting in which 3 and zero are assigned as access category values to the IP packet including the control information and the IP packet including the data information, respectively (step S212).

  With this setting, wireless terminal apparatus 202A transmits control information to communication partner access point 102 with priority over data information.

  Next, the wireless terminal device 202A periodically transmits “communication information” including the decreased throughput to the management device 101 via the access point 102A (step S214). At this time, the wireless terminal device 202A preferentially transmits “communication information” as control information to the access point 102A even when there is data information to be transmitted to the access point 102A, for example.

  Next, when the management apparatus 101 receives “communication information” from the wireless terminal apparatus 202A, the value of the access category stored in the header of the IP packet including the received “communication information” is 3. It is recognized that the communication state between the device 202A and the access point 102A has deteriorated. Then, the management apparatus 101 switches the setting to give 3 and zero as the access category value for the IP packet including the control information and the IP packet including the data information (step S216). Although not shown in FIG. 10, the management apparatus 101 receives “communication information” from the wireless terminal apparatus 202 other than the wireless terminal apparatus 202A, for example.

  With this setting, the control information transmitted by the management apparatus 101 is transmitted to the wireless terminal apparatus 202A with priority over the data information at each access point 102.

  Next, the access point 102 </ b> A periodically transmits “communication information” including throughput and the like that has decreased due to an increase in communication load in itself to the management apparatus 101 (step S <b> 218). Although not shown in FIG. 10, the management apparatus 101 receives “communication information” from an access point 102 other than the access point 102A, for example.

  Next, the management apparatus 101 comprehensively determines to switch the communication connection destination of the wireless terminal apparatus 202A based on the “communication information” received from each wireless terminal apparatus 202 and each access point 102 (step S220). Then, a “network reconfiguration request” including the determination result is transmitted to the wireless terminal device 202A via the access point 102A (step S222). At this time, for example, even when there is data information to be transmitted to each wireless terminal device 202, the access point 102A preferentially transmits a “network reconfiguration request” that is control information to the wireless terminal device 202A.

  Next, the wireless terminal device 202A transmits a “response to the network reconfiguration request”, which is a response to the “network reconfiguration request”, to the management device 101 via the access point 102A (step S224).

  Then, the wireless terminal device 202A transmits a “disconnect request” for disconnecting the communication connection with the access point 102A to the access point 102A. At this time, the wireless terminal device 202A gives priority to the control information “response to network reconfiguration request” and “disconnect request” to the access point 102A even when there is data information to be transmitted to the access point 102A, for example. (Step S226). Thereby, the communication connection between the access point 102A and the wireless terminal device 202A is disconnected.

  Then, the wireless terminal device 202A performs a search process for the access point 102 as a new communication partner.

  Specifically, the wireless terminal device 202A detects a use channel of one or a plurality of access points 102 existing around the wireless terminal device 202A, and receives a “network reconfiguration request” received from the management device 101 from the detected channels. The channel used by the access point 102B included in is identified. Then, the wireless terminal device 202A determines, as a new communication partner, the access point 102B that uses the identified channel among the one or more access points 102 existing around the wireless terminal device 202A. Communication connection processing is performed between the access point 102B and the wireless terminal device 202A, thereby establishing a communication connection between the access point 102B and the wireless terminal device 202A (step S228).

  Next, the wireless terminal device 202A transmits, for example, temperature information from the sensor 36 as data information to the management device 101 via the access point 102B (step S230).

  Next, when receiving data information from the wireless terminal device 202A, the management device 101 transmits, for example, information for operating the actuator 37 to the wireless terminal device 202A via the access point 102B as data information (step S232).

  Next, for example, when the measurement result of the communication traffic indicates that the throughput is recovered by switching the communication connection destination to the access point 102B, the wireless terminal device 202A, based on the measurement result, between itself and the access point 102B Recognize that the communication state is good. Then, the wireless terminal device 202A switches to a setting in which zero and 3 are assigned as access category values to the IP packet including the control information and the IP packet including the data information, respectively (step S234).

  By this setting, the wireless terminal device 202A transmits data information to the access point 102B with priority over the control information.

  Next, the wireless terminal device 202A transmits, for example, temperature information from the sensor 36 as data information to the management device 101 via the access point 102B (step S236). At this time, the wireless terminal device 202A preferentially transmits temperature information, which is data information, to the access point 102B even when there is control information to be transmitted to the access point 102B, for example.

  Next, when the management apparatus 101 receives the data information from the wireless terminal apparatus 202A, the value of the access category stored in the header of the IP packet including the received data information is 3, so the management apparatus 101 and the access information It is recognized that the communication state between the points 102B is good. Then, the management apparatus 101 switches to a setting that assigns zero and 3 as access category values to the IP packet including control information and the IP packet including data information, respectively (step S238).

  With this setting, the data information transmitted by the management apparatus 101 is transmitted to the wireless terminal apparatus 202A with priority over the control information at the access point 102B.

  Next, the management apparatus 101 transmits, for example, information for operating the actuator 37 as data information to the wireless terminal apparatus 202A via the access point 102B (step S240). At this time, the access point 102B preferentially transmits data information to the wireless terminal device 202A even when there is control information to be transmitted to each wireless terminal device 202, for example.

  Next, the wireless terminal device 202A periodically transmits “communication information” including the recovered throughput and the like to the management device 101 via the access point 102B (step S242).

[simulation]
FIG. 11 is a diagram showing an outline of simulation modeling the network reconfiguration processing in the radio communication system according to the embodiment of the present invention.

  Referring to FIG. 11, a wireless communication system 402 that models wireless communication system 401 includes management apparatus 101, access points 102J, 102K, and 102L, and 100 wireless terminal apparatuses 202.

  The access points 102J, 102K, and 102L are communicatively connected to the management apparatus 101. The access point 102J is arranged at a position 100 meters away from the access point 102K. The access point 102L is arranged at a position opposite to the access point 102J with respect to the access point 102K.

  Access points 102J, 102K, and 102L use channels # 1, # 6, and # 11, respectively. That is, the frequency bands of the radio signals used by the access points 102J, 102K, and 102L do not overlap.

  100 wireless terminal devices 202 exist in a direction orthogonal to the arrangement direction, which is the direction of viewing the access point 102K from the access point 102J, and are arranged in a region Rg1 that is 100 meters away from the access point 102J.

  100 wireless terminal apparatuses 202 are arranged in the arrangement direction at an interval of 10 centimeters in the region Rg1.

  The simulation was performed according to the following procedure. That is, (1) 100 wireless terminal devices 202 in the region Rg1 are activated simultaneously at time t = 0. (2) After activation, the 100 wireless terminal apparatuses 202 in the region Rg1 establish communication connection with the access point 102J having the highest RSSI measurement value. (3) Congestion occurs in wireless communication between the 100 wireless terminal devices 202 and the access point 102J, and a situation occurs in which IP packets including data information are not transmitted and received correctly. (4) The management apparatus 101 performs control for switching the communication connection destination of the wireless terminal apparatus 202 from the access point 102J to the access point 102K or the access point 102L, every 10 seconds.

  FIG. 12 is a diagram illustrating an example of parameters used in the simulation illustrated in FIG.

  Referring to FIG. 12, application 11 in management apparatus 101 and application 31 in wireless terminal apparatus 202 include, for example, a communication control application and a data communication application.

  The data communication application in the management apparatus 101 and the wireless terminal apparatus 202 transmits the following IP packets at a cycle of 100 milliseconds. That is, the IP packet includes data of a constant bit rate (Constant Bit Rate) and has a data size of 128 bytes. In the IP packet header, zero is stored as the value of the access category.

  The communication control application in the management apparatus 101 receives control information regarding at least one of communication traffic and communication quality from the communication control application in the wireless terminal apparatus 202 every 5 seconds. The communication control application in the management apparatus 101 determines switching of the communication connection destination of the wireless terminal apparatus 202 every 10 seconds, and transmits control information related to topology change processing. In the header of the IP packet transmitted by the communication control application in the management apparatus 101 and the wireless terminal apparatus 202, zero or 3 is stored as the value of the access category.

  FIG. 13 is a diagram illustrating an example of a temporal change in throughput in the wireless terminal device obtained by the simulation illustrated in FIG. 11.

  FIG. 13 shows a simulation result when the value of the access category of the IP packet transmitted by the communication control application shown in FIG. 12 is set to zero.

  As shown in FIG. 13, 20 seconds after the activation of 100 wireless terminal apparatuses 202, congestion occurs in wireless communication between the 100 wireless terminal apparatuses 202 and the access point 102J.

  When the access category value of the IP packet transmitted by the data communication application and the access category value of the IP packet transmitted by the communication control application are the same, that is, when the control information and the data information are transmitted equally, the IP including the control information The waiting time until a packet is transmitted becomes longer.

  For this reason, since the management apparatus 101 cannot promptly transmit a “network reconfiguration request” to the wireless terminal apparatus 202, the communication connection destination of the wireless terminal apparatus 202 is changed from the access point 102J to the access point 102K or the access point 102L. The situation that doesn't switch continues. Therefore, in the case of FIG. 13, even if 500 seconds elapse after starting the wireless terminal device 202, the throughput is not improved in many wireless terminal devices 202.

  FIG. 14 is a diagram illustrating another example of the temporal change in throughput in the wireless terminal device obtained by the simulation illustrated in FIG. 11.

  FIG. 14 shows a simulation result when the value of the access category of the IP packet transmitted by the communication control application shown in FIG.

  As shown in FIG. 14, 20 seconds after the activation of 100 wireless terminal apparatuses 202, as in FIG. 13, congestion occurs in wireless communication between the 100 wireless terminal apparatuses 202 and the access point 102J. .

  When the value of the access category of the IP packet transmitted by the communication control application is larger than the value of the access category of the IP packet transmitted by the data communication application, that is, between the wireless terminal device 202 and the access point 102J, the control information becomes data information. On the other hand, when preferentially transmitted, the waiting time until an IP packet including control information is transmitted is shortened.

  For this reason, the management apparatus 101 quickly transmits a “network reconfiguration request” to the wireless terminal apparatus 202 even when congestion occurs in the wireless communication between the 100 wireless terminal apparatuses 202 and the access point 102J. be able to.

  Thereby, the communication connection destination of the wireless terminal device 202 can be quickly switched from the access point 102J to the access point 102K or the access point 102L.

  Accordingly, in the case of FIG. 14, when 300 seconds elapse after the wireless terminal device 202 is activated, the throughput of many wireless terminal devices 202 is improved.

  FIG. 15 is a diagram illustrating an example of a temporal change in the total QoE of 100 wireless terminal devices obtained by the simulation illustrated in FIG.

  Referring to FIG. 15, the total QoE becomes 80 or more when 300 seconds have elapsed since activation of wireless terminal apparatus 202, and becomes 100 when 350 seconds have elapsed. From the simulation conditions, it is considered that 30 wireless terminal devices 202 switched the communication connection destination from the access point 102J to the access point 102K or the access point 102L within 300 seconds.

  As described above, the control information is preferentially transmitted with respect to the data information between the wireless terminal device 202 and the access point 102J, so that QoE of all 100 wireless terminal devices 202 can be obtained within a short time of 350 seconds. Can be improved.

  In wireless communication system 401 according to the embodiment of the present invention, access point 102 and wireless terminal device 202 preferentially transmit control information according to the communication state between access point 102 and wireless terminal device 202. Although it is the configuration, it is not limited to this. For example, at least one of the access point 102 and the wireless terminal device 202 may be configured to preferentially transmit control information according to the communication state between the access point 102 and the wireless terminal device 202.

  Moreover, in the wireless communication system 401 according to the embodiment of the present invention, the management apparatus 101 and the wireless terminal apparatus 202 have priority of control information and data information according to the communication state between the access point 102 and the wireless terminal apparatus 202. However, the present invention is not limited to this. For example, it is only necessary that at least one of the management apparatus 101 and the wireless terminal apparatus 202 sets the priority of control information and data information according to the communication state between the access point 102 and the wireless terminal apparatus 202.

  By the way, in such an M2M system, when the number of wireless terminal devices increases, collision of wireless signals from each wireless terminal device is likely to occur, and waiting time until transmission for avoiding the collision increases. In such a case, the frequency utilization efficiency in the M2M system is lowered, and the user's feeling of use of the wireless terminal device is lowered.

  On the other hand, in the wireless communication system according to the embodiment of the present invention, the wireless resource used when transmitting / receiving information between the wireless terminal device 202 and the access point 102 causes the wireless terminal device 202 to set a new access point 102. Control information for starting communication as a communication connection destination and data information are shared. At least one of the wireless terminal device 202 and the access point 102 transmits control information preferentially according to the communication state between the wireless terminal device 202 and the access point 102.

  With such a configuration, for example, even if the number of the wireless terminal devices 202 increases in the wireless communication system 401 and a state in which a collision of wireless signals from each wireless terminal device 202 occurs occurs, Since the control information is transmitted with priority, the wireless terminal device 202 can quickly establish a communication connection with the new access point 102.

  As a result, the standby time until transmission for avoiding collision of radio signals from each radio terminal apparatus 202 can be reduced, so that the frequency use efficiency in the radio communication system 401 is improved and the radio terminal apparatus A decrease in the user's feeling of use 202 can be suppressed. That is, good wireless communication can be realized between the plurality of wireless terminal devices 202 and the plurality of access points 102.

  In addition, since the radio resource is shared by the control information and the data information, it is possible to eliminate the need for exchanging information for newly securing a radio resource for control information. Thereby, the increase in the information amount transmitted / received in the radio | wireless communications system 401 can be suppressed.

  In the radio communication system according to the embodiment of the present invention, at least one of radio terminal apparatus 202 and access point 102 transmits control information and data information according to the priority set in control information and data information, respectively. Send. At least one of the management device 101 and the wireless terminal device 202 sets a priority for the control information and the data information according to the communication state.

  With such a configuration, in communication between the wireless terminal device 202 and the access point 102, the priority of control information and data information can be dynamically set according to the communication state. Efficiency can be improved.

  Further, since the management apparatus 101 can comprehensively determine the communication state between each wireless terminal apparatus 202 and each access point 102 in the wireless communication system 401, the priority of control information and data information is appropriately set. be able to.

  Further, in the wireless communication system according to the embodiment of the present invention, when the communication state deteriorates, at least one of the management apparatus 101 and the wireless terminal apparatus 202 causes the priority of the control information to be higher than the priority of the data information. Priorities of control information and data information are set so as to be higher.

  With such a configuration, in a situation where the network including the wireless terminal device 202 and the access point 102 needs to be reconfigured, the control information is transmitted preferentially over the data information, so that the network reconfiguration is smoothly performed. The communication state can be improved. Thereby, the communication traffic or communication quality of the whole network can be improved.

  In the wireless communication system according to the embodiment of the present invention, at least one of wireless terminal apparatus 202 and access point 102 transmits wireless terminal apparatus 202 and access point in a state where control information is preferentially transmitted. When the communication state between 102 satisfies a predetermined condition, preferential transmission of control information is stopped and data information is preferentially transmitted.

  With such a configuration, for example, when the communication state is improved, the data information is preferentially transmitted over the control information between the wireless terminal device 202 and the access point 102, so appropriate priority control according to the communication state is performed. be able to.

  Further, when the communication state is improved, for example, it is possible to prevent the transmission timing of data information that is not allowed to be delayed such as audio data and video data from being delayed by the control information.

  Thereby, since the wireless terminal device 202 can receive data information such as audio data and video data without delay, QoE can be improved.

  In the radio communication system according to the embodiment of the present invention, at least one of radio terminal apparatus 202 and access point 102 is at least one of communication traffic and communication quality between radio terminal apparatus 202 and access point 102. In response to the control information, the control information is preferentially transmitted.

  With such a configuration, it is possible to appropriately determine the communication state according to communication traffic or communication quality, and to preferentially transmit control information.

  The management device according to the embodiment of the present invention manages the access point 102 and the wireless terminal device 202. The wireless resources used when transmitting and receiving information between the wireless terminal device 202 and the access point 102 are control information and data information for the wireless terminal device 202 to start communication with the new access point 102 as a communication connection destination. Shared. The communication unit 10 can communicate with the wireless terminal device 202 connected to the access point 102 via the access point 102. At least one of the wireless terminal device 202 and the access point 102 transmits the control information and the data information according to the priority set in the control information and the data information, respectively. And the priority control part 19 sets a priority to control information and data information according to the communication state between the radio | wireless terminal apparatus 202 and the access point 102. FIG.

  With such a configuration, in communication between the wireless terminal device 202 and the access point 102, the priority of control information and data information can be dynamically set according to the communication state, so that the management device 101 and the access point 102 In addition, the communication efficiency in the wireless communication system 401 configured by the wireless terminal device 202 can be improved.

  As a result, the standby time until transmission for avoiding collision of radio signals from each radio terminal apparatus 202 can be reduced, so that the frequency use efficiency in the radio communication system 401 is improved and the radio terminal apparatus A decrease in the user's feeling of use 202 can be suppressed. That is, good wireless communication can be realized between the plurality of wireless terminal devices 202 and the plurality of access points 102.

  Further, since the management apparatus 101 can comprehensively determine the communication state between each wireless terminal apparatus 202 and each access point 102 in the wireless communication system 401, the priority of control information and data information is appropriately set. be able to.

  In addition, since the radio resource is shared by the control information and the data information, it is possible to eliminate the need for exchanging information for newly securing a radio resource for control information. Thereby, the increase in the information amount transmitted / received in the radio | wireless communications system 401 can be suppressed.

  In addition, the wireless terminal device according to the embodiment of the present invention communicates with the access point 102 and uses the wireless resource used when transmitting / receiving information between the wireless terminal device 202 and the access point 102 as a wireless terminal device. 202 shows the communication state between the communication unit 30 shared by the control information for starting communication with the new access point 102 as the communication connection destination and the data information, and the communication state between the own wireless terminal device 202 and the access point 102 A communication state acquisition unit 41 for acquisition. And the communication part 30 transmits control information preferentially according to the communication state acquired by the communication state acquisition part 41. FIG.

  With such a configuration, for example, in the wireless communication system configured by the access point 102 and the wireless terminal device 202, the number of wireless terminal devices 202 increases, and a state in which a collision of wireless signals from each wireless terminal device 202 occurs occurs. Even so, since the control information is preferentially transmitted according to the occurrence of the state, the wireless terminal device 202 can quickly establish a communication connection with the new access point 102.

  As a result, the standby time until transmission for avoiding collision of radio signals from each radio terminal apparatus 202 can be reduced, so that the frequency utilization efficiency in the radio communication system can be improved, and the radio terminal apparatus A decrease in the user's feeling of use 202 can be suppressed. That is, good wireless communication can be realized between the plurality of wireless terminal devices 202 and the plurality of access points 102.

  In addition, since the radio resource is shared by the control information and the data information, it is possible to eliminate the need for exchanging information for newly securing a radio resource for control information. Thereby, an increase in the amount of information transmitted and received in the wireless communication system can be suppressed.

  Further, the access point according to the embodiment of the present invention communicates with the wireless terminal device 202, and uses the wireless resource used when transmitting / receiving information between the access point 102 and the wireless terminal device 202 as a wireless terminal device. 202 shows the communication state between the communication unit 20 shared by the control information for starting communication with the new access point 102 as the communication connection destination and the data information, and the communication state between the own access point 102 and the wireless terminal device 202. A communication state acquisition unit 65 to acquire. And the communication part 20 transmits control information preferentially according to the communication state acquired by the communication state acquisition part 65. FIG.

  With such a configuration, for example, in the wireless communication system configured by the access point 102 and the wireless terminal device 202, the number of wireless terminal devices 202 increases, and a state in which a collision of wireless signals from each wireless terminal device 202 occurs occurs. Even so, since the control information is preferentially transmitted according to the occurrence of the state, the wireless terminal device 202 can quickly establish a communication connection with the new access point 102.

  As a result, the standby time until transmission for avoiding collision of radio signals from each radio terminal apparatus 202 can be reduced, so that the frequency utilization efficiency in the radio communication system can be improved, and the radio terminal apparatus A decrease in the user's feeling of use 202 can be suppressed. That is, good wireless communication can be realized between the plurality of wireless terminal devices 202 and the plurality of access points 102.

  In addition, since the radio resource is shared by the control information and the data information, it is possible to eliminate the need for exchanging information for newly securing a radio resource for control information. Thereby, an increase in the amount of information transmitted and received in the wireless communication system can be suppressed.

  The above embodiment should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

10, 20, 30 Communication unit 11, 27, 31 Application 12, 21, 32 TCP processing unit 13, 22, 33 IP processing unit 14, 23 Ether MAC processing unit 15, 24 Ether PHY processing unit 16 Database 18, 41, 65 Communication status acquisition unit 19 Priority control unit 25, 34 Wireless LAN MAC processing unit 26, 35 Wireless LAN PHY processing unit 36 Sensor 37 Actuator 38, 64 Wireless transmission unit 39, 56 Data information processing unit 40, 63 Wireless reception unit 42, 66 Communication control unit 51, 62 Reception unit 52, 61 Transmission unit 53, 43 Communication state extraction unit 54, 44 Communication state determination unit 55, 45 Data information acquisition unit 101 Management device 102 Access point (wireless base station device and wireless communication device) )
202 wireless terminal device (wireless communication device)
401 wireless communication system

Claims (11)

One or more radio base station apparatuses;
One or more wireless terminal devices,
The radio resource used when transmitting / receiving information between the radio terminal device and the radio base station device is control information for the radio terminal device to start communication with the new radio base station device as a communication connection destination, and It is shared with other information,
A wireless communication system in which at least one of the wireless terminal device and the wireless base station device preferentially transmits the control information according to a communication state between the wireless terminal device and the wireless base station device. At least one of the wireless terminal device and the wireless base station device transmits the other information preferentially over the control information according to the communication state, and the control over the other information. The wireless communication system according to claim 1, wherein a state in which information is preferentially transmitted is switched. The wireless communication system further includes:
A management device for managing the wireless base station device and the wireless terminal device;
The wireless terminal device can communicate with the management device via the wireless base station device of a communication connection destination,
At least one of the wireless terminal device and the wireless base station device transmits the control information and the other information according to the priority set in the control information and the other information, respectively.
The wireless communication system according to claim 1 or 2 , wherein at least one of the management device and the wireless terminal device sets a priority for the control information and the other information according to the communication state. . When at least one of the management device and the wireless terminal device deteriorates the communication state, the control information and the other information are set so that the priority of the control information becomes higher than the priority of the other information. The wireless communication system according to claim 3 , wherein priority of information is set. In a state where at least one of the radio terminal device and the radio base station device is transmitting the control information preferentially, a communication state between the radio terminal device and the radio base station device satisfies a predetermined condition If, preferential transmission of the control information is stopped, and transmits the other information preferentially, the wireless communication system according to any one of claims 1 to 4. At least one of the wireless terminal device and the wireless base station device gives priority to the control information according to at least one of communication traffic and communication quality between the wireless terminal device and the wireless base station device. The wireless communication system according to any one of claims 1 to 5 , wherein the transmission is performed. A management device that manages a radio base station device and a radio terminal device,
The radio resource used when transmitting / receiving information between the radio terminal device and the radio base station device is control information for the radio terminal device to start communication with the new radio base station device as a communication connection destination, and It is shared with other information,
A communication unit capable of communicating with the wireless terminal device connected to the wireless base station device via the wireless base station device;
At least one of the wireless terminal device and the wireless base station device transmits the control information and the other information according to the priority set in the control information and the other information, respectively.
The management device further includes:
A management apparatus comprising: a priority control unit configured to set a priority for the control information and the other information according to a communication state between the radio terminal apparatus and the radio base station apparatus. A wireless communication device,
The wireless terminal device communicates with another wireless communication device, and the wireless terminal device communicates with the new wireless base station device as a communication connection destination using wireless resources used when transmitting and receiving information between the wireless communication device and the other wireless communication device. As a control unit for starting communication as a communication unit shared with other information,
A communication state acquisition unit for acquiring a communication state between the own wireless communication device and the other wireless communication device;
The communication unit is a wireless communication device that preferentially transmits the control information according to the communication state acquired by the communication state acquisition unit. A communication control method in a radio communication system comprising one or more radio base station devices and one or more radio terminal devices,
The radio resource used when transmitting / receiving information between the radio terminal device and the radio base station device is control information for the radio terminal device to start communication with the new radio base station device as a communication connection destination, and It is shared with other information,
At least one of the wireless terminal device and the wireless base station device acquires a communication state between the wireless terminal device and the wireless base station device;
And at least one of the wireless terminal device and the wireless base station device, wherein the control information is preferentially transmitted according to the acquired communication state. A communication control program used in a management apparatus that manages a radio base station apparatus and a radio terminal apparatus,
The radio resource used when transmitting / receiving information between the radio terminal device and the radio base station device is control information for the radio terminal device to start communication with the new radio base station device as a communication connection destination, and It is shared with other information,
At least one of the wireless terminal device and the wireless base station device transmits the control information and the other information according to the priority set in the control information and the other information, respectively.
On the computer,
Obtaining a communication state between the wireless terminal device and the wireless base station device;
A communication control program for executing a step of setting a priority for the control information and the other information according to the acquired communication state. A communication control program used in a wireless communication device,
On the computer,
Obtaining a communication state between the self wireless communication device and another wireless communication device;
The wireless terminal device communicates with the other wireless communication device, and the wireless terminal device communicates with the new wireless base station device using the wireless resources used when transmitting and receiving information between the own wireless communication device and the other wireless communication device. A program for executing control information for starting communication as a connection destination and a step shared by other information,
In the step of communicating with the other wireless communication device, a communication control program for preferentially transmitting the control information according to the acquired communication state.

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