JP6142195B2 - Wireless communication system, wireless base station, wireless communication method, and program - Google Patents

Description

  The present invention relates to a wireless communication system or the like including a wireless base station and one or more terminal devices that wirelessly communicate with the wireless base station according to a result of carrier sense.

  Conventionally, IEEE802.11e is known as a QoS (Quality of Service) control method in a wireless LAN (see Non-Patent Document 1). In the IEEE 802.11e, QoS can be controlled in communication between an access point and a terminal device. Specifically, a transmission queue is prepared for each application such as video, audio, and text, and control is performed to transmit transmission packets stored in the transmission queue in accordance with their priority.

  In addition, in CISCO's ClearAir technology, spectrum sensing is performed at the access point, and the usage status by other wireless systems in the frequency band to be used is observed. Then, the result is exchanged between access points using the Neighbor Message, and interference is reduced according to the result, so that it is possible to shift to a more appropriate frequency, control transmission power, and the like.

"IEEE Standard 802.11e", IEEE, 2005

However, in the conventional QoS control method based on IEEE802.11e, wireless transmission is performed according to a priority order determined in advance for each type of application such as video, voice, and text, regardless of the state of available wireless resources. For example, when radio resources are insufficient, there is a problem that control according to the radio resources cannot be performed.
Further, in the ClearAir technology, since the access point performs all the control, there is a problem that the terminal device cannot secure an optimal radio resource according to the latest situation.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a wireless communication system that can secure appropriate wireless resources according to the communication quality of a wireless communication network.

In order to achieve the above object, a wireless communication system according to the present invention is a wireless communication system including a wireless base station and one or more terminal devices that perform wireless communication with the wireless base station. A communication quality acquisition unit that acquires communication quality related to communication, a usage guideline information generation unit that generates usage guideline information used in settings related to wireless communication using the communication quality acquired by the communication quality acquisition unit, and usage guideline information generation A base station transmission unit that transmits a beacon including usage guideline information generated by the unit, and a base station reception unit that receives information transmitted from the terminal device, and the terminal device includes a terminal reception unit that receives a beacon A setting unit that performs settings related to wireless communication according to the usage guideline information included in the beacon received by the terminal receiving unit, a terminal transmitting unit that transmits information according to the setting by the setting unit, and a terminal Depending on the carrier sense result using the signal unit, and the terminal transmission controller for controlling transmission by the terminal transmission unit, provided with, those.
With such a configuration, the usage guideline information can be transmitted to each terminal device without using an individual control message, and wireless communication by each terminal device can be controlled all at once by the usage guideline information. . As a result, free radio resources can be increased and the probability of interference with other radio bursts can be reduced.

In the wireless communication system according to the present invention, the terminal device further includes a determination unit that determines whether the usage guideline information violates the wireless communication policy of the terminal device, and the setting unit includes a wireless communication system of the terminal device. If the determination unit determines that the communication policy is violated, the setting according to the usage guideline information is not performed, and if the determination unit determines that the usage guideline information does not violate the wireless communication policy of the terminal device May be set according to the usage guideline information.
With such a configuration, the usage guideline information can be used as a guide instead of a command, and the setting contrary to the wireless communication policy in the terminal device can be prevented. As a result, for example, it is possible to prevent a decrease in the satisfaction level of the user of the terminal device.

In the wireless communication system according to the present invention, the terminal device further includes a reception unit that receives a communication path evaluation from a user, and the terminal transmission unit transmits the evaluation received by the reception unit to the wireless base station. The reception unit receives the evaluation transmitted by the terminal transmission unit, and the communication quality acquisition unit is acquired using the evaluation received by the base station reception unit, according to the subjective quality information of the communication path evaluated by the user Communication quality may be acquired.
With such a configuration, it is possible to generate usage guideline information in consideration of user evaluation. As a result, for example, user satisfaction can be improved.

  In the wireless communication system according to the present invention, the communication quality is one or more pieces of information selected from information on the observation quality of the communication path, information on the subjective quality of the communication path evaluated by the user, and information indicating normal / emergency. It may be information according to.

  In the wireless communication system according to the present invention, the usage guideline information is an instruction regarding one or more items selected from the modulation scheme, coding rate, frequency, transmission power, signal bandwidth, communication quality control, and communication priority. May be included.

In the wireless communication system according to the present invention, the base station receiving unit receives a beacon transmitted from another wireless base station, and the usage guideline information generating unit is included in the beacon transmitted from the other wireless base station. The usage guideline information may also be generated using the usage guideline information.
With such a configuration, it is possible to infer the status of other wireless networks using beacons, and by generating usage guideline information according to the status, it is possible to control the quality of the own cell and the radio resources between cells. You can adjust the use of Further, since there is no need to transmit / receive messages between radio base stations, it is possible to increase free radio resources and reduce the probability of interference with other radio bursts.

In the wireless communication system according to the present invention, the usage guide information may be information for each application.
With such a configuration, fine control and setting can be performed for each application.

  The wireless communication method according to the present invention is a wireless communication method processed in a wireless base station that performs wireless communication with one or more terminal devices, a communication quality acquisition step for acquiring communication quality related to wireless communication, and communication quality Using the communication quality acquired in the acquisition step, a usage guideline information generation step that generates usage guideline information used in settings related to wireless communication, and a base station that transmits a beacon including the usage guideline information generated in the usage guideline information generation step A transmission step.

  The radio communication method according to the present invention is a radio communication method processed in a terminal device that performs radio communication with a radio base station, and is used in settings related to radio communication generated using communication quality related to radio communication. A terminal reception step for receiving a beacon including usage guideline information, a setting step for performing settings related to wireless communication in accordance with the usage guideline information included in the beacon received in the terminal reception step, a carrier sense step for performing carrier sense, and a carrier A terminal transmission step of transmitting information according to the result of carrier sense in the sense step and the setting in the setting step.

  According to the wireless communication system and the like according to the present invention, the usage guideline information can be transmitted to each terminal device without using an individual control message, and the wireless communication by each terminal device can be controlled simultaneously by the usage guideline information. As a result, efficient use of radio resources can be realized.

1 is a block diagram showing a configuration of a wireless communication system according to Embodiment 1 of the present invention. A flowchart showing the operation of the radio base station according to the embodiment The flowchart which shows operation | movement of the terminal device by the embodiment The figure which shows an example of the priority for every application in the embodiment The figure which shows an example of the priority for every application in the embodiment Schematic diagram showing an example of the appearance of the computer system in the embodiment The figure which shows an example of a structure of the computer system in the embodiment

  Hereinafter, the radio | wireless communications system by this invention is demonstrated using embodiment. In the following embodiments, components and steps denoted by the same reference numerals are the same or equivalent, and repetitive description may be omitted.

(Embodiment 1)
A radio communication system according to Embodiment 1 of the present invention will be described with reference to the drawings. The radio communication system according to the present embodiment realizes appropriate allocation of radio resources using the usage guideline information included in the beacon.

  FIG. 1 is a block diagram showing a configuration of a wireless communication system 100 according to the present embodiment. A radio communication system 100 according to the present embodiment includes a radio base station 1 and one or more terminal devices 2. The radio base station 1 and the terminal device 2 perform radio communication. The radio base station 1 may be connected to an external network such as the Internet, an intranet, or a public telephone line network. The radio base station 1 may connect the terminal device 2 to an external network. The radio base station 1 may be an access point that connects the terminal device 2 to an external network. 1 shows a case where the wireless communication system 100 has only one terminal device 2, the wireless communication system 100 may have two or more terminal devices 2. . 1 shows only one radio communication system 100, other radio communication systems 100 may exist. In that case, the radio base station 1 may be able to receive information transmitted from the radio base station 1 included in the other radio communication system 100.

  The radio base station 1 includes a reception unit 11, a communication quality acquisition unit 12, a usage guideline information generation unit 13, a base station transmission unit 14, a base station reception unit 15, a processing unit 16, a transmission queue 17, And a base station transmission control unit 18.

  The accepting unit 11 accepts information indicating an emergency / normal time to be described later. This information is information indicating whether the present time is emergency or normal. An emergency is a situation in which many people want to communicate, for example, during a disaster such as an earthquake, flood, typhoon, or fire. The information may be manually set by, for example, the Japan Meteorological Agency, other government agencies, managers, etc., and automatically using seismometers, anemometers, barometers, rain gauges, etc. It may be set. For example, the reception unit 11 may receive information input from an input device (for example, a keyboard, a mouse, or a touch panel), and may receive information transmitted via a wired or wireless communication line. The receiving unit 11 may or may not include a device for receiving (for example, an input device or a network card). In addition, the reception unit 11 may be realized by hardware, or may be realized by software such as a driver that drives a predetermined device.

The communication quality acquisition unit 12 acquires communication quality related to wireless communication. The communication quality related to wireless communication is information indicating whether the wireless communication between the wireless base station 1 and one or more terminal devices 2 is free or congested. The communication quality may be information corresponding to one or more pieces of information selected from information on the observation quality of the communication path, information on the subjective quality of the communication path evaluated by the user, and information indicating normal / emergency, for example. It may be other information indicating the degree of communication quality related to wireless communication. The observation quality and the subjective quality are information indicating the degree of congestion of the communication path. On the other hand, the information indicating normal / emergency is information for determining a required level such as communication quality. For example, in voice transmission, communication with high sound quality is required in normal times, but in an emergency, an increase in intelligibility and the number of connected lines are required. Information according to one or more information selected from the information on the observation quality of the communication path, the information on the subjective quality of the communication path evaluated by the user, and the information indicating normal / emergency includes the one or more information. It may be information, a value corresponding to one or more pieces of information, or other information according to observation quality information or the like. The value corresponding to the one or more pieces of information may be, for example, a value of a function having the one or more pieces of information as arguments, and is a value associated with the one or more pieces of information by a table or the like. Also good. When the communication quality is a value of a function having observation quality information or the like as an argument, for example, the communication quality η is a value of a function Q having arguments f, d, and e as shown in the following equation. There may be.
η = Q (f, d, e)

  Here, f may be observation quality, d may be subjective quality, and e may be information indicating the environment. The information indicating the environment may be information indicating the above-described normal / emergency. Note that the argument of the function Q may be one or more arguments selected from f, d, and e. In addition, when the communication quality is information according to the observation quality information, the higher the observation quality, the higher the communication quality. For example, the function Q may be an increasing function of the argument f. In addition, when the communication quality is information according to the subjective quality information, the higher the subjective quality, the higher the communication quality. For example, the function Q may be an increasing function of the argument d. In addition, when the communication quality is information according to information indicating normal / emergency, the communication quality is better in normal than in emergency. For example, the function Q may be a function having a higher value when the argument e indicates a normal time than when the argument e indicates an emergency. The function Q may be a different function depending on the value of e. For example, function Q (f, d, e = normal) = function Q1 (f, d), and function Q (f, d, e = emergency) = function Q2 (f, d). . For any f and d, it is assumed that Q1 (f, d)> Q2 (f, d). Further, the communication quality may be information indicating the congestion status as long as the communication quality can be understood as a result. The above-mentioned η may be considered to be QoE (Quality of Experience).

  The information on the observation quality of the communication path may include, for example, information that can be measured according to transmission / reception of packets, or may include information that can be acquired according to the number of packets queued in the transmission queue 17. It may be a value corresponding to at least one of the information. The value corresponding to the information may be, for example, a value of a function using the information as an argument, or may be a value associated with the information by a table or the like. The information on the observation quality of the communication path may be considered to be QoS, for example. The information that can be measured according to packet transmission / reception may be, for example, throughput, delay, jitter, packet loss rate (packet loss rate), and frequency band. It may be a frequency usage state indicating whether or not is used, a bit error rate, or any combination of two or more thereof. Further, the information that can be measured according to packet transmission / reception may be a value corresponding to one or more pieces of information, such as throughput. The value corresponding to the one or more pieces of information may be, for example, a value of a function having the one or more pieces of information as arguments, and is a value associated with the one or more pieces of information by a table or the like. Also good. For example, the higher the throughput, the higher the observation quality, the shorter the delay, the higher the observation quality, the lower the jitter, the higher the observation quality, and the lower the packet loss rate, the higher the observation quality. The smaller the (channel), the higher the observation quality, and the lower the bit error rate, the higher the observation quality. Note that these pieces of information may be information observed by the radio base station 1, information observed by the terminal device 2, or both of them. When the result observed by the terminal device 2 is also used, the communication quality acquisition unit 12 may use the observation result of the terminal device 2 received by the base station receiving unit 15. In addition, in order to acquire information that can be measured according to packet transmission / reception, a probe packet may be used, or a packet for other purposes may be used. Further, the information that can be acquired according to the number of queued packets may be the number of packets queued in the transmission queue 17, and the rate of change in the number of queued packets (for example, , Increase rate or decrease rate per unit time, etc.), or both of them, or at least one of the number of queued packets and the rate of change of the number of packets It may be a value corresponding to. The value corresponding to at least one may be, for example, a value of a function having at least one of them as an argument, or may be a value associated with at least one of them by a table or the like. For example, when the number of packets queued in the transmission queue 17 increases or exceeds the threshold, it is considered that there is a lot of transmission traffic and the observation quality is low. Further, when the number of packets queued in the transmission queue 17 is decreasing or lower than the threshold value, the transmission traffic is small and the observation quality is considered high. The observation quality information may be information for each application. In this case, the information that can be measured according to packet transmission / reception may be information measured using packets transmitted / received by a certain application, for example, and acquired according to the number of queued packets. The information that can be obtained may be information acquired according to the number of packets queued in the transmission queue 17 used in a certain application, for example.

  The information on the subjective quality of the communication path may be information acquired from the evaluation of the communication path by the user transmitted from the terminal device 2 and received by the base station receiving unit 15 as described later, for example. . That is, the communication quality acquisition unit 12 may acquire subjective quality information using the evaluation. The evaluation may be information indicating whether or not the user is satisfied with communication such as video, voice, and text. The evaluation may be two-stage information such as satisfaction / dissatisfaction, three-stage information such as satisfaction / normal / unsatisfaction, and may be information of four or more stages. For example, when video or audio is interrupted or there is a lot of noise, the evaluation of the communication path by the user is “unsatisfied”, and otherwise, the evaluation of the communication path by the user is “satisfied”. The communication quality acquisition unit 12 may acquire the subjective quality information so that the subjective quality is higher as the evaluation indicating satisfaction is higher, and the subjective quality is lower as the evaluation indicating dissatisfaction is higher. . And the communication quality acquisition part 12 may acquire the communication quality according to the information of the subjective quality. The subjective quality information may be information for each application. In that case, the subjective quality information corresponding to a certain application may be acquired using the user's evaluation regarding the application.

  Note that the observation quality and the subjective quality may be average values for a predetermined period. The predetermined period may be, for example, a predetermined period immediately before the time when the communication quality is acquired, or may be another period. In addition, when the radio base station 1 is performing radio communication with a plurality of terminal devices 2, the communication quality itself or information used for acquiring the communication quality (for example, observation quality, subjective quality, throughput) Etc.) may be values corresponding to a plurality of wireless communications with the plurality of terminal devices 2. The values corresponding to a plurality of wireless communications may be representative values such as communication quality, observation quality, subjective quality, and throughput of the plurality of wireless communications. The representative value may be, for example, an average value or a median value.

  The information indicating the normal time / emergency is information received by the receiving unit 11 as described above. The communication quality acquisition unit 12 may acquire the communication quality according to the latest information among the information indicating the normal time / emergency received by the reception unit 11. For example, the latest information indicating the normal time / emergency may be stored in a recording medium (not shown).

  The usage guideline information generation unit 13 uses the communication quality acquired by the communication quality acquisition unit 12 to generate usage guideline information used in settings related to wireless communication. The usage guideline information is information indicating a guideline for using radio resources. The usage guideline information may be, for example, an instruction regarding a parameter related to wireless communication. The parameter related to wireless communication may be a communication parameter or a communication target parameter. Specifically, the usage guideline information may include an instruction regarding one or more items selected from the modulation scheme, coding rate, frequency, transmission power, signal bandwidth, communication quality control, and communication priority. . For example, an instruction related to communication quality control is an instruction related to a communication target parameter, and an instruction related to other than communication quality control is an instruction related to a communication parameter. The instruction may be an instruction to change the modulation method or the like (for example, increase or decrease), and an instruction to set the modulation method or the like to a certain value (for example, set to A, B Etc.) or other instructions relating to the modulation method or the like. When the communication quality acquired by the communication quality acquisition unit 12 is information for each application, the usage guideline information generation unit 13 may generate usage guideline information for each application. Note that the usage guideline information may be generated, for example, so as to maximize the aforementioned η. More specifically, it is preferable that the usage guideline information is generated so that the communication quality of one or more radio communications performed in the cell of the radio base station 1 is improved as a whole. In addition, in order to improve the communication quality as a whole, the communication quality may be deteriorated for some of the terminal devices 2 by setting according to the usage guideline information. For example, when the communication quality of a plurality of other terminal devices 2 is reduced because the specific terminal device 2 occupies many frequency bands, the communication quality of the specific terminal device 2 is lowered. The usage guideline information generation unit 13 may generate usage guideline information that improves the communication quality of other terminal devices 2. In that case, although the communication quality of the specific terminal device 2 is lowered, the communication quality of other terminal devices 2 can be improved, and as a result, the communication quality of the wireless communication in the cell is improved as a whole. To be able to.

  Here, the relationship between the instruction | indication regarding each of a modulation system, a coding rate, a frequency, transmission power, a signal bandwidth, communication quality control, and communication priority, and the acquired communication quality is demonstrated. The usage guideline information generation unit 13 may generate usage guideline information corresponding to the acquired communication quality as described below.

  The instruction about the modulation scheme is changed to increase the number of transmission bits per modulation when the communication quality is high (for example, the instruction to change the modulation scheme to 64QAM or the modulation scheme to increase the number of transmission bits in one step) When the communication quality is low, an instruction to reduce the number of transmission bits per modulation (for example, an instruction to set the modulation method to BPSK, or a modulation method with a small number of transmission bits in one step) Or an instruction to change so as to be. If the communication quality includes observation quality information and subjective quality information, and the observation quality is high and the subjective quality is low, the instruction regarding the modulation method is a transmission bit per modulation. An instruction to increase the number may be used.

  The instruction regarding the coding rate may be an instruction to increase the coding rate (for example, an instruction to increase the coding rate to 3/4 or an instruction to increase the coding rate by one level) when the communication quality is high. When the communication quality is low, an instruction to decrease the coding rate (for example, an instruction to halve the coding rate or an instruction to decrease the coding rate by one level) may be used. Note that when communication quality includes observation quality information and the observation quality information includes a bit error rate, an instruction regarding the coding rate when the bit error rate is large is the coding rate. The instruction regarding the coding rate when the bit error rate is small may be an instruction for increasing the coding rate.

  Note that the instruction related to the modulation scheme and the instruction related to the coding rate may be integrated. For example, the instruction regarding them may be an instruction to increase the data rate when the communication quality is high, and may be an instruction to decrease the data rate when the communication quality is low. Specifically, when wireless communication is performed according to the IEEE 802.11n standard, the instruction to increase the data rate is an instruction to increase the MCS (Modulation and Coding Scheme) index, and the instruction to decrease the data rate is: It may be an instruction to decrease the MCS index. However, it is preferable that the MCS index is changed within a range where the number of streams does not change.

  When the communication quality is high, the frequency-related instruction may be an instruction that does not limit the frequency (that is, an instruction that the frequency is not specified, an instruction that the number of channels used for communication is two or more, etc.). When the frequency is low, it may be an instruction to limit the frequency (for example, an instruction to perform communication using channel 3 which is an empty channel, an instruction to set the number of channels used for communication to one channel, or the like). Note that the frequency may be specified outside the channel.

  The instruction regarding the transmission power may be an instruction not to limit the transmission power when the communication quality is high, or an instruction to reduce the transmission power, and an instruction to limit the transmission power when the communication quality is low (for example, the transmission power is lower than the lower limit). Or an instruction to increase the transmission power.

  The instruction related to the signal bandwidth may be an instruction to increase the bandwidth (for example, an instruction to increase the signal bandwidth to 40 MHz, an instruction to increase the signal bandwidth by 5 MHz, or the like) when the communication quality is high. When it is low, it may be an instruction to narrow the bandwidth (for example, an instruction to reduce the signal bandwidth to 20 MHz, an instruction to narrow the signal bandwidth by 5 MHz, or the like). If the communication quality includes subjective quality, the signal bandwidth instruction is an instruction to increase the bandwidth when the subjective quality is low, and an instruction to reduce the signal bandwidth when the subjective quality is high. Also good. In addition, when the communication quality includes observation quality, and the instruction regarding the signal bandwidth is an instruction for each application, the instruction regarding the signal bandwidth corresponding to the text communication application is the observation quality. May be an instruction to narrow the bandwidth when the signal quality is low, and an instruction to widen the signal bandwidth when the subjective quality is high. By doing in this way, it is thought that the transmission opportunity regarding communication of a text can be increased.

  Instructions relating to communication quality control include instructions for increasing communication quality (for example, instructions for increasing the communication quality by one level, instructions for setting the communication quality to 32 kbps, and packet transmission frequency from the transmission queue when the communication quality is high. Or an instruction for increasing the communication quality, for example, an instruction for lowering the communication quality by one step, an instruction for reducing the communication quality to 9.6 kbps, or transmission. For example, an instruction to reduce the packet transmission frequency from the queue). The instruction related to the communication quality control may be an instruction for controlling the communication quality of the application.

  The instruction regarding the communication priority may be an instruction to communicate with a priority when the communication quality is high when the communication quality is high, and an instruction to communicate with a priority when the communication quality is low when the communication quality is low. There may be. The communication priority may be, for example, a priority for each application as shown in FIG. 4A. The priority order when the communication quality is high may be different from the priority order when the communication quality is low. For example, when the communication quality is low, the priority of the application “voice” may be high. If the communication quality includes information indicating normal / emergency, the communication priority order is given according to the normal order when the information indicating normal / emergency indicates normal. If the information indicating normal / emergency indicates an emergency, the command may be an instruction to communicate with priority according to the emergency.

  The base station transmission unit 14 transmits a beacon including the usage guideline information generated by the usage guideline information generation unit 13. A beacon is a signal that the radio base station 1 repeatedly transmits. The beacon may be transmitted periodically, for example. The transmission cycle may be, for example, 100 (ms) or another cycle. The beacon may be a signal including the identifier of the radio base station 1 in addition to the usage guideline information, for example. The identifier of the wireless base station 1 may be, for example, an SSID (Service Set Identifier) in the IEEE 802.11 standard. When the usage guideline information is information for each application, the usage guideline information for each application may be included in the beacon. Moreover, the base station transmission part 14 may transmit information other than a beacon. For example, the base station transmission unit 14 may transmit information received by the terminal device 2 in communication performed via a communication line such as the Internet to the terminal device 2. Specifically, the base station transmission unit 14 may sequentially transmit the packets queued in the transmission queue 17. At the time of the transmission, the base station transmission unit 14 may perform transmission according to the control of the base station transmission control unit 18 using the result of carrier sense. The base station transmitter 14 normally transmits information wirelessly via an antenna. The base station transmission unit 14 may or may not include a transmission device (for example, a network card) for performing transmission. In addition, the base station transmission unit 14 may be realized by hardware, or may be realized by software such as a driver that drives a transmission device.

  The base station reception unit 15 receives information transmitted from the terminal device 2. For example, the base station reception unit 15 may receive the evaluation of the communication path by the user transmitted by the terminal transmission unit 27 of the terminal device 2. Further, the base station receiving unit 15 may receive other information. In addition, the base station receiving unit 15 may perform carrier sense. Carrier sense is detection (sensing) of an empty frequency band. The base station receiving unit 15 normally receives information transmitted wirelessly via an antenna. Note that the base station receiving unit 15 may or may not include a wireless receiving device (for example, a network card) for receiving. In addition, the base station receiving unit 15 may be realized by hardware, or may be realized by software such as a driver that drives a receiving device.

  The processing unit 16 performs processing related to received information and transmitted information. The processing unit 16 may perform the processing for each application. For example, when voice communication is performed, the processing unit 16 accumulates packets corresponding to the voice communication received from the external network in the transmission queue 17 or the voice communication received by the base station reception unit 15. It is also possible to perform processing such as receiving a packet according to and sending it to an external network. In addition, when queuing can be performed for each application in the transmission queue 17, the processing unit 16 may accumulate packets in the transmission queue 17 for each application. For example, when the base station receiving unit 15 receives the evaluation of the communication path by the user, the processing unit 16 extracts the evaluation information from the packet including the evaluation and passes it to the communication quality acquiring unit 12. Alternatively, it may be stored in a recording medium (not shown).

  The transmission queue 17 temporarily stores information before transmission. As described above, the transmission queue 17 may store information for each application. The transmission queue 17 can be realized by a predetermined recording medium (for example, a semiconductor memory or a magnetic disk).

  The base station transmission control unit 18 controls transmission by the base station transmission unit 14 according to the result of carrier sense using the base station reception unit 15. Specifically, the base station transmission control unit 18 may specify a vacant frequency according to the carrier sense result, and may control the base station transmission unit 14 to transmit at the specified frequency. The control by the base station transmission control unit 18 may be, for example, CSMA / CA (Carrier Sense Multiple Access / Collection Avidance) control. Note that it is already known to control the frequency used in communication according to the result of carrier sense, and a detailed description thereof will be omitted.

The terminal device 2 includes a terminal reception unit 21, a determination unit 22, a setting unit 23, a reception unit 24, a processing unit 25, a transmission queue 26, a terminal transmission unit 27, and a terminal transmission control unit 28. .
The terminal reception unit 21 receives a beacon transmitted from the radio base station 1. Further, the terminal receiving unit 21 may receive information other than the beacon. Further, the terminal receiving unit 21 may perform carrier sense. Further, the terminal receiving unit 21 normally receives information transmitted wirelessly via an antenna. The terminal reception unit 21 may or may not include a wireless reception device (for example, a network card) for performing reception. Further, the terminal receiving unit 21 may be realized by hardware, or may be realized by software such as a driver that drives a receiving device.

  The determination unit 22 determines whether the usage guideline information included in the beacon received by the terminal reception unit 21 is contrary to the wireless communication policy of the terminal device 2. Here, the wireless communication policy of the terminal device 2 may be, for example, a policy by a user, a policy by an application, or both. The policy by the user may be, for example, a policy set by the user, or a policy according to the evaluation of the communication path by the user (this evaluation will be described later) received by the receiving unit 24. The policy set by the user may be, for example, a policy of setting according to the usage guideline information, a policy of not setting according to the usage guideline information, or the communication quality may be The policy may be that the setting is performed according to the usage guideline information only when it becomes higher. Further, the policy set by the user may be a policy indicating whether or not the setting according to the guideline is performed for each instruction (for example, for each modulation scheme, coding rate, etc.) included in the usage guideline information. Good. The policy according to the evaluation by the user is, for example, to perform communication with higher communication quality than the current state when the evaluation of the communication path by the user is low, and when the evaluation of the communication path by the user is high. The communication may be performed with the current communication quality or with an arbitrary communication quality. The policy based on the application may be, for example, a policy according to an object that the processing unit 25 wishes to communicate with. The target to be communicated may be, for example, communication content (for example, whether it is a voice or text) or a communication amount (communication capacity). The policy is, for example, when the communication content of the target to be communicated by the processing unit 25 requires high communication quality (for example, when the communication content is video), or the amount of communication of the target to which the processing unit 25 wishes to communicate In this case, communication is performed with high communication quality, and when the communication content of the target that the processing unit 25 wants to communicate does not require high communication quality or when the communication amount of the target that the processing unit 25 wants to communicate is small The communication may be performed with any communication quality. Note that the amount of communication to be communicated may be determined from the total amount of data to be communicated, or may be determined from the amount of data queued in the transmission queue 26. Further, the wireless communication policy of the terminal device 2 may be a policy according to criteria other than those described above. When two or more policies are used, for example, when a user policy and an application policy are used, the wireless communication policy of the terminal device 2 may include these two or more policies, or those policies. One policy generated from two or more policies may be used. Of the wireless communication policies of the terminal device 2, those other than the policies set by the user may be generated by the processing unit 25. Further, the wireless communication policy of the terminal device 2 may be information for each application. The wireless communication policy of the terminal device 2 is stored in a recording medium (not shown), and the determination unit 22 may read it and use it for determination processing.

  In the case where the higher communication quality or higher communication quality is required by the wireless communication policy of the terminal device 2, the determination unit 22 is used when the usage guideline information is a guideline for reducing the communication quality. It may be determined that the usage guideline information violates the wireless communication policy of the terminal device 2. On the other hand, when the communication quality is not limited by the wireless communication policy of the terminal device 2, it may be determined that the usage guideline information does not violate the wireless communication policy of the terminal device 2. Specifically, if communication with higher throughput is required according to the wireless communication policy of the terminal device 2, an instruction regarding a modulation method with a smaller number of transmission bits or a coding rate is smaller in the usage guideline information. An instruction regarding the coding rate, an instruction for limiting the frequency, an instruction regarding the transmission power at which the transmission power is reduced, an instruction regarding the signal bandwidth for narrowing the bandwidth, an instruction regarding the communication quality control for reducing the communication quality, When an instruction regarding a communication priority order that lowers the priority order is included, each instruction may be determined to violate the wireless communication policy of the terminal device 2. The determination may be made for each instruction. That is, for a certain usage guideline information, for example, an instruction regarding a modulation scheme does not violate the wireless communication policy of the terminal apparatus 2, but an instruction regarding a signal bandwidth may be determined to violate the wireless communication policy of the terminal apparatus 2. . When the usage guideline information included in the beacon is information for each application, or when the wireless communication policy of the terminal device 2 is information for each application, the determination unit 22 uses the usage guideline information for each application. It may be determined whether the wireless communication policy of the terminal device 2 matches. When the user sets a policy for performing setting according to the usage guideline information, the determination unit 22 determines that the usage guideline information does not violate the wireless communication policy of the terminal device 2. Good. If the user has set a policy not to perform setting according to the usage guideline information, the determination unit 22 determines that the usage guideline information violates the wireless communication policy of the terminal device 2. Good. In addition, when a policy is set by the user to perform setting according to the usage guideline information only when the communication quality is high, the determination unit 22 is a guideline for improving the communication quality. Sometimes it is determined that the usage guideline information does not violate the wireless communication policy of the terminal device 2, and when the usage guideline is a guideline for reducing communication quality, it is determined that the usage guideline information violates the wireless communication policy of the terminal device 2. May be. Further, the determination unit 22 may make other determinations. For example, the determination unit 22 may determine whether to compare the usage guideline information included in the beacon with the wireless communication policy of the terminal device 2. Specifically, when the usage guideline information is not updated, the determination unit 22 may determine not to compare both. Further, when the usage guideline information is not included in the strongest beacon, the determination unit 22 may determine not to compare the two. This is to prevent setting according to usage guideline information included in beacons from other cells.

  When the determination unit 22 determines that the usage guideline information included in the beacon received by the terminal reception unit 21 does not violate the wireless communication policy of the terminal device 2, the setting unit 23 responds to the usage guideline information. Make settings related to wireless communication. When the determination is performed for each application, the setting unit 23 may perform settings related to wireless communication for each application. In addition, when a determination is made for each instruction included in the usage guideline information, the setting unit 23 may perform settings related to wireless communication for each instruction. On the other hand, when the determining unit 22 determines that the usage guideline information violates the wireless communication policy of the terminal device 2, the setting unit 23 does not perform setting according to the usage guideline information. By doing in this way, the setting according to the usage guideline information is performed within a range that does not violate the policy of the terminal device 2, and the user guideline of the terminal device 2 is reduced by the usage guideline information, Can be prevented from being adversely affected. For example, in the usage guideline information, the setting unit 23 may set the terminal transmission unit 27 according to an instruction related to a communication parameter, or set the processing unit 25 according to an instruction related to a communication target parameter. Also good. For example, the setting unit 23 sets the modulation scheme, the coding rate, the frequency, the transmission power, the signal bandwidth, and the communication priority with respect to the terminal transmission unit 27, and the communication unit 25 sets the communication quality control. Settings may be made for. Note that the setting unit 23 may transmit a modulation scheme or the like according to an instruction related to communication parameters to the radio base station 1 via a control channel or the like. Specifically, the setting unit 23 may control the processing unit 25 so as to transmit a modulation scheme or the like according to an instruction regarding communication parameters and an identifier of the terminal device 2 to the radio base station 1. As a result, such information may be transmitted to the radio base station 1 via the transmission queue 26 and the terminal transmission unit 27. In addition, when the wireless base station 1 receives such information, when transmitting to the terminal device 2 identified by the received identifier, the wireless base station 1 performs transmission according to the received modulation scheme or the like. As a result, the terminal receiving unit 21 can receive information by a modulation method or the like according to the usage guideline information. If it is determined that some of the two or more instructions included in the usage guideline information (for example, instructions regarding the modulation scheme, etc.) do not violate the wireless communication policy of the terminal device 2, the setting unit For 23, only the instruction that does not violate the wireless communication policy of the terminal device 2 may be set according to the instruction.

  The receiving unit 24 receives a communication path evaluation from the user. As described above, the evaluation may be information of two levels such as satisfaction / dissatisfaction, or may be information of three or more levels. The receiving unit 24 may receive information other than evaluation, for example, operations related to communication, operations related to applications, and the like. For example, the receiving unit 24 may receive information input from an input device (for example, a keyboard, a mouse, or a touch panel), and may receive information transmitted via a wired or wireless communication line. The accepting unit 24 may or may not include a device for accepting (for example, an input device or a network card). The receiving unit 24 may be realized by hardware, or may be realized by software such as a driver that drives a predetermined device.

  The processing unit 25 performs processing related to received information and transmitted information. The processing unit 25 may perform the process for each application. For example, when voice communication is being performed, the processing unit 25 accumulates packets corresponding to the voice communication in the transmission queue 26 or receives packets corresponding to the voice communication received by the terminal receiving unit 21. You may perform processes, such as. In the transmission queue 26, when queuing can be performed for each application, the processing unit 25 may accumulate packets in the transmission queue 26 for each application. For example, when the reception unit 24 receives an evaluation of a communication path by a user, the processing unit 25 may perform processing so that a packet including the evaluation is transmitted to the radio base station 1. Specifically, the processing unit 25 may accumulate packets including the evaluation in the transmission queue 26. Further, the processing unit 25 may generate a wireless communication policy of the terminal device 2. For example, when the evaluation received by the receiving unit 24 indicates that the evaluation of the communication path by the user is low, the processing unit 25 may generate a policy for performing communication with higher communication quality than the current state. When the evaluation of the communication path by the user is normal or indicated as high, the processing unit 25 may generate a policy for performing communication with an arbitrary communication quality. In addition, the processing unit 25 generates a policy for performing communication with high communication quality when the communication content requires high communication quality, or when the communication amount is large, and does not request communication quality with high communication content. When the amount of communication is small, a policy for performing communication with an arbitrary communication quality may be generated. Further, the processing unit 25 may generate a wireless communication policy of the terminal device 2 according to other criteria. The processing unit 25 may store the generated policy on a recording medium (not shown). In addition, when the setting unit 23 performs setting according to an instruction related to communication quality control, the processing unit 25 may perform processing according to the setting. For example, when the communication quality is set to 9.6 kbps, the processing unit 25 may perform processing so that transmission is performed at that speed. For example, the processing unit 25 may control the frequency of transmission from the transmission queue 26 in response to an instruction to increase or decrease the frequency of transmission from the transmission queue 26.

  The transmission queue 26 temporarily stores information before transmission. In the transmission queue 26, information may be stored for each application. The transmission queue 26 can be realized by a predetermined recording medium (for example, a semiconductor memory or a magnetic disk).

  The terminal transmission unit 27 transmits information according to the setting by the setting unit 23. For example, when the modulation unit is set to 64QAM by the setting unit 23, the terminal transmission unit 27 performs transmission using the modulation method “64QAM”. Further, the terminal transmission unit 27 may perform transmission according to control by the terminal transmission control unit 28 using the carrier sense result. For example, the terminal transmission unit 27 may perform transmission using a set modulation scheme or the like in a frequency band that is confirmed to be free by carrier sense. Further, the terminal transmission unit 27 may transmit the communication path evaluation by the user accepted by the acceptance unit 24 to the radio base station 1. Further, the terminal transmission unit 27 may transmit information other than evaluation. For example, the terminal transmitter 27 may transmit information transmitted by the terminal device 2 in communication performed via a communication line such as the Internet to the radio base station 1. Specifically, the terminal transmission unit 27 may sequentially transmit the packets queued in the transmission queue 26. The terminal transmitter 27 normally transmits information wirelessly via an antenna. Note that the terminal transmission unit 27 may or may not include a transmission device (for example, a network card) for performing transmission. The terminal transmission unit 27 may be realized by hardware, or may be realized by software such as a driver that drives the transmission device.

  The terminal transmission control unit 28 controls transmission by the terminal transmission unit 27 according to the result of carrier sense using the terminal reception unit 21. Specifically, the terminal transmission control unit 28 may specify a vacant frequency according to the carrier sense result, and may control the terminal transmission unit 27 to transmit at the specified frequency. The control by the terminal transmission control unit 28 may be CSMA / CA control, for example. Note that it is already known to control the frequency used in communication according to the result of carrier sense, and a detailed description thereof will be omitted.

  Further, when the information on the observation quality of the communication path is information according to the information observed by the terminal device 2, the terminal device 2 has a measurement unit (not shown) that measures information such as throughput. Also good. Then, the terminal transmission unit 27 may transmit information such as throughput measured by the measurement unit to the radio base station 1.

  Next, the operation of the radio base station 1 will be described using the flowchart of FIG. Note that the flowchart of FIG. 2 mainly shows processing by components other than the processing unit 16. Accordingly, the processing unit 16 may accumulate the information to be transmitted in the transmission queue 17 or perform processing according to the received information separately from the flowchart of FIG.

  (Step S101) The usage guideline information generation unit 13 determines whether to generate usage guideline information. If the usage guideline information is generated, the process proceeds to step S102. If not, the process proceeds to step S104. For example, the usage guideline information generation unit 13 may periodically determine that the usage guideline information is generated, and generates usage guideline information every time the amount of information transmitted and received by the radio base station 1 becomes a predetermined amount. It may be determined, or it may be determined that the usage guideline information is generated at other timing.

  (Step S102) The communication quality acquisition unit 12 acquires the communication quality. When the communication quality is acquired, the communication quality acquisition unit 12 may use information indicating a communication path evaluation by a user or normal / emergency stored in a recording medium (not shown). The communication quality acquisition unit 12 may use the amount of information queued in the transmission queue 17 or the result of carrier sense by the base station reception unit 15 when acquiring the communication quality.

  (Step S103) The usage guideline information generation unit 13 generates usage guideline information using the communication quality acquired in step S102. The generated usage guideline information may be temporarily stored in a recording medium (not shown). Then, the process returns to step S101.

  (Step S104) The base station transmission unit 14 determines whether or not to transmit a beacon. And when transmitting a beacon, it progresses to step S105, and when that is not right, it progresses to step S107. For example, the base station transmission unit 14 may periodically determine that a beacon is transmitted, or may determine that a beacon is transmitted at other timing.

  (Step S105) The base station transmission unit 14 generates a beacon including the latest usage guide information generated by the usage guide information generation unit 13.

  (Step S106) The base station transmission unit 14 transmits the generated beacon. Then, the process returns to step S101.

  (Step S107) The base station reception unit 15 determines whether information has been received. If the information is received, the process proceeds to step S108. If not, the process proceeds to step S109.

  (Step S108) The processing unit 16 or the like performs processing according to reception. For example, when the base station receiving unit 15 receives the evaluation of the communication path by the user, the processing unit 16 may store the evaluation in a recording medium (not shown). Then, the process returns to step S101.

  (Step S109) The base station transmitter 14 determines whether to transmit information. And when transmitting, it progresses to step S110, and when that is not right, it progresses to step S113. Note that the base station transmission unit 14 may periodically determine to transmit when there is information queued in the transmission queue 17, for example.

  (Step S110) The base station transmission control unit 18 determines whether to perform carrier sense. If carrier sense is to be performed, the process proceeds to step S111. If not, the process proceeds to step S112. For example, the base station transmission control unit 18 may determine that the carrier sense is to be performed when a predetermined time or more has elapsed since the previous carrier sense, and when a decrease in transmission path quality is detected. In addition, it may be determined that carrier sense is performed, or it may be determined that carrier sense is performed at other timing.

  (Step S111) The base station receiving unit 15 performs carrier sense.

  (Step S112) The base station transmission unit 14 transmits information according to the control of the base station transmission control unit 18 using the latest carrier sense result. Then, the process returns to step S101.

  (Step S113) The reception unit 11 determines whether information indicating a normal time or an emergency has been received. If the information is accepted, the process proceeds to step S114. If not, the process returns to step S101.

  (Step S114) The accepting unit 11 accumulates information indicating the accepted normal / emergency in a recording medium (not shown). Then, the process returns to step S101.

  In the flowchart of FIG. 2, the process is terminated by powering off or a process termination interrupt. If the beacon transmission frequency is equal to the usage guideline information generation frequency, the process may proceed from step S103 to step S105. In that case, the process may proceed to step S107 when NO in step S101.

Next, operation | movement of the terminal device 2 is demonstrated using the flowchart of FIG. Note that the flowchart in FIG. 3 mainly shows processing by components other than the processing unit 25. Therefore, the processing unit 25 may accumulate the information to be transmitted in the transmission queue 26 or perform processing according to the received information separately from the flowchart of FIG.
(Step S201) The terminal receiving unit 21 determines whether information has been received. If received, the process proceeds to step S202, and if not, the process proceeds to step S207.

  (Step S202) The terminal reception unit 21 determines whether a beacon has been received. If a beacon is received, the process proceeds to step S203, and if not, the process proceeds to step S206.

  (Step S <b> 203) The determination unit 22 determines whether to compare the usage guideline information included in the received beacon with the wireless communication policy of the terminal device 2. For example, when the terminal reception unit 21 receives beacons from two or more wireless base stations 1, the determination unit 22 determines whether the radio wave intensity of the beacon received in step S201 is strongest, and is strongest In addition, it may be determined that the usage guideline information generation unit and the wireless communication policy of the terminal device 2 are compared. Otherwise, it may be determined that the two are not compared. By doing so, it becomes possible to use the usage guide information of a cell having a large influence of interference and interference. When making this determination, the determination unit 22 may temporarily store the intensity of the beacon received in the past in association with the identifier of the radio base station 1. Further, the determination unit 22 temporarily stores the latest usage guideline information received in the past, and the usage guideline information included in the beacon received in step S201 is temporarily stored. It may be determined whether it matches the usage guideline information. If they match, the usage guideline information has not been updated, and therefore the determination unit 22 may determine not to compare the usage guideline information generation unit and the wireless communication policy of the terminal device 2. If they do not match, since the usage guideline information has been updated, the determination unit 22 may determine to compare the usage guideline information generation unit and the wireless communication policy of the terminal device 2. If the usage guideline information is compared with the wireless communication policy of the terminal device 2, the process proceeds to step S204. Otherwise, the process returns to step S201.

  (Step S <b> 204) The determination unit 22 determines whether the usage guideline information included in the received beacon violates the wireless communication policy of the terminal device 2. If the usage guideline information does not violate the wireless communication policy of the terminal device 2, the process proceeds to step S205, and if not, the process returns to step S101. When the comparison between the usage guideline information and the policy of the terminal device 2 is performed for each application, if it is determined that the usage guideline information and the policy of the terminal device 2 are not contradictory in any application, step S205 is performed. To proceed.

  (Step S205) The setting unit 23 sets communication according to the usage guideline information. Note that the usage guideline information and the policy of the terminal device 2 are compared for each application, and when it is determined that the usage guideline information and the policy of the terminal device 2 do not contradict each other application, 23 sets communication according to the usage guideline information only for the application for which it is determined that the usage guideline information and the policy of the terminal device 2 do not contradict each other.

  (Step S206) The processing unit 25 performs a process according to the information received by the terminal receiving unit 21. Then, the process returns to step S101.

  (Step S207) The terminal transmission unit 27 determines whether to transmit information. And when transmitting, it progresses to step S208, and when that is not right, it progresses to step S211. For example, when there is information queued in the transmission queue 26, the terminal transmission unit 27 may periodically determine to transmit the information.

  (Step S208) The terminal transmission control unit 28 determines whether to perform carrier sense. And when performing carrier sense, it progresses to step S209, and when that is not right, it progresses to step S210. For example, the terminal transmission control unit 28 may determine that the carrier sense is performed when a predetermined time or more has passed since the previous carrier sense, and when a decrease in transmission path quality is detected. It may be determined that carrier sense is performed, or it may be determined that carrier sense is performed at other timing.

  (Step S209) The terminal receiving unit 21 performs carrier sense.

  (Step S210) The terminal transmission unit 27 transmits information according to the setting by the setting unit 23 and the control of the terminal transmission control unit 28 using the latest carrier sense result. Then, the process returns to step S201.

  (Step S211) The receiving unit 24 determines whether or not the evaluation of the communication path has been received from the user. And when it receives, it progresses to step S212, and when that is not right, it returns to step S201.

  (Step S <b> 212) The processing unit 25 accumulates the evaluation of the communication path by the user accepted by the accepting unit 24 in the transmission queue 26 in order to transmit to the radio base station 1. When the evaluation is received in association with a certain application, the processing unit 25 may transmit the evaluation to the radio base station 1 so that the evaluation is an evaluation of the application. . Specifically, it may be transmitted together with the application identifier. Then, the process returns to step S201.

  In the flowchart of FIG. 3, the process ends when the power is turned off or the process is terminated. In the flowchart of FIG. 3, the case where the determination process of step S <b> 203 is performed has been described. For example, when two or more beacons are not received or when the usage guideline information is updated for each beacon, the determination is performed. It is not necessary to perform processing.

  Next, the operation of radio communication system 100 according to the present embodiment will be described using a specific example. In this specific example, in order to simplify the explanation, it is assumed that the usage guideline information is an instruction to change the modulation scheme, coding rate, and communication priority. In this specific example, the terminal device 2 determines the wireless communication policy of the terminal device 2 according to the evaluation of the communication path by the user and the number of packets queued in the transmission queue 26. . That is, when the evaluation by the user within the latest 30 minutes is low or when the number of queued packets is large, the processing unit 25 generates a policy for performing communication with high communication quality. In this case, a policy for performing communication with an arbitrary communication quality is generated.

  Each terminal device 2 holds a normal table shown in FIG. 4A and an emergency table shown in FIG. 4B as priority tables for associating application types with priorities. Shall. 4A and 4B, the priority, the identifier for identifying the application type, and the application type are associated with each other. The application type is a type corresponding to each application. For example, an application type corresponding to an application that performs voice communication such as a telephone is “voice”, and an application type corresponding to an application that performs video distribution is “video”. is there. The correspondence between the individual application and the application type may be set by, for example, an application designer or may be set by a user. Further, comparing FIG. 4A and FIG. 4B, the video priority is lowered in an emergency. This is because, in an emergency, it is considered that other communication is given priority over communication using moving images. In this specific example, in order to simplify the description, the usage guideline information and the evaluation of the communication path by the user are not performed for each application.

First, it is assumed that the wireless base station 1 and the terminal device 2 are performing wireless communication in a state where the use frequency band is very vacant. Further, it is assumed that the latest information indicating the normal time / emergency received by the reception unit 11 indicates “normal”. Further, it is assumed that the unsatisfactory rate by the received evaluation is 5%. In addition, the ratio assumes that the evaluation received within the last 30 minutes is used. Therefore, at that time, a high throughput, a small delay / jitter, a low packet loss rate / bit error rate, and a low frequency usage state are acquired (steps S101 and S102), and the following usage guideline information is generated accordingly, as shown in FIG. It is assumed that the data has been stored in the recording medium not to be used (step S103).
Modulation method: 64QAM
Coding rate: 3/4
Communication priority: For normal use

  When the beacon transmission timing comes (step S104), the base station transmission unit 14 generates a beacon including usage guideline information having the modulation method and the like (step S105), and transmits the beacon (step S106). Note that the beacon includes the SSID “AP101” of the wireless base station 1. The transmitted beacon is received by the terminal receiver 21 of the terminal device 2 (steps S201 and S202). Then, the determination unit 22 overwrites and updates the beacon strength corresponding to the SSID “AP101” in the information associating the SSID stored so far with the beacon strength. And it is judged whether the updated beacon intensity | strength is the largest compared with another beacon intensity | strength. In this case, it is assumed that the beacon intensity corresponding to the SSID “AP101” is the highest. Next, the determination unit 22 determines whether the usage guideline information stored so far and the usage guideline information included in the beacon are the same. In this case, it is assumed that they are different. Then, the determination unit 22 updates the usage guideline information by overwriting the received usage guideline information with the stored usage guideline information, and the usage guideline information and the wireless communication policy of the terminal device 2 are updated. Are compared (step S203).

  Here, in the terminal device 2, it is assumed that there has been no input of communication path evaluation by the user until that time, and that the number of packets queued in the transmission queue 26 is not large. Therefore, it is assumed that the processing unit 25 has generated a policy for performing communication with an arbitrary communication quality. Then, the determination unit 22 determines that the usage guideline information does not violate the wireless communication policy of the terminal device 2 (step S204), and passes the determination result to the setting unit 23. Then, the setting unit 23 performs setting according to the usage guideline information included in the beacon received by the terminal receiving unit 21. In other words, the modulation scheme is 64QAM, the coding rate is 3/4, and the priority table is set to use the one shown in FIG. 4A (step S205). Communication according to the setting is performed between the radio base station 1 and the terminal device 2 (steps S109 to S112, S107, 108, S201, 202, S206, and S207 to 210).

Thereafter, it is assumed that the number of wireless terminals other than the terminal device 2 that performs communication in the cell of the wireless base station 1 has increased. Therefore, the communication quality acquisition unit 12 acquires a high usage state of the frequency channel to be used (steps S101 and S102). As a result, the following usage guideline information is used to reduce the influence of interference caused by surrounding wireless terminal signals. Is generated (step S103).
Modulation method: 16QAM
Encoding rate: 1/2
Communication priority: For normal use

  The usage guideline information is included in the beacon and transmitted in the same manner as described above (steps S104 to S106), and the terminal device 2 is set according to the usage guideline information (steps S201 to S205). ). In accordance with the change in the setting, the communication rate of the wireless communication between the wireless base station 1 and the terminal device 2 is lowered, the satisfaction of the user of the terminal device 2 is lowered, and the user clicks the “dissatisfied” button. Or suppose you tap it. Then, the reception unit 24 receives the user's evaluation “unsatisfied” (step S211) and passes it to the processing unit 25. The processing unit 25 configures a packet including the evaluation “unsatisfied” and accumulates the packet in the transmission queue 26 (step S212). Further, the processing unit 25 stores the fact that the evaluation “unsatisfied” has been accepted and the date and time thereof in a recording medium (not shown). Further, it is assumed that the processing unit 25 generates a policy for performing communication with high communication quality according to the evaluation.

Thereafter, it is assumed that the number of wireless terminals that perform communication in the cell of the wireless base station 1 further increases, and as a result, low communication quality is acquired by the communication quality acquisition unit 12 (steps S101 and S102). Then, the usage guideline information generation unit 13 generates the next usage guideline information accordingly (step S103).
Modulation method: QPSK
Encoding rate: 1/2
Communication priority: For normal use

  The usage guideline information is included in the beacon and transmitted (steps S104 to S106) and received by the terminal device 2 (steps S201 and S202) in the same manner as described above. Further, it is assumed that the determination unit 22 determines that the beacon has the highest beacon strength and determines that the usage guideline information is different from that stored so far (step S203). On the other hand, the usage guideline information lowers the communication rate, but the wireless communication policy of the terminal device 2 is a policy of performing communication with high communication quality. It is determined that the policy of 2 is violated (step S204). As a result, the terminal apparatus 2 performs communication while setting the modulation scheme “16QAM” and the coding rate “1/2”.

Assume that more than 30 minutes have elapsed since the terminal device 2 received the evaluation “unsatisfied” from the user. Then, it is assumed that the processing unit 25 has generated a policy for performing communication with an arbitrary communication quality. Thereafter, it is assumed that the reception unit 11 receives information indicating an emergency in response to the occurrence of an earthquake (step S113). Then, the accepting unit 11 accumulates the information in a recording medium (not shown) (Step S114). Then, it is assumed that the usage guide information generation unit 13 generates the next usage guide information at the next timing of generating the usage guide information (steps S101 to S103).
Modulation method: 16QAM
Encoding rate: 1/2
Communication priority: for emergency

  The usage guideline information is included in the beacon and transmitted in the same manner as described above (steps S104 to S106), and the terminal device 2 is set according to the usage guideline information (steps S201 to S205). ). In accordance with the change of the setting, wireless communication between the wireless base station 1 and the terminal device 2 is performed using the priority table of FIG. 4B.

  As described above, according to the wireless communication system 100 according to the present embodiment, it is possible to transmit usage guide information to all the terminal devices 2 in the cell by using a beacon. Can be achieved. In addition, since the usage guideline information is included in the beacon and transmitted, an increase in the amount of communication associated with the transmission of the usage guideline information can be suppressed as compared to the case where the usage guideline information is transmitted in an individual control message. . As a result, an increase in free radio resources can be realized. Further, in the case of controlling the quality of an application according to instructions regarding communication quality control included in the usage guideline information, the number of transmission packets can be adjusted for all terminal devices 2 in the cell, and the use of radio resources You can control the situation. In addition, the usage guideline information is based on relatively long-term trends such as radio resources and application quality, but actual radio resource reservation is based on the results of carrier sense. It will be made according to the usage situation. Therefore, it is considered that appropriate communication control can be performed in consideration of both a long-term trend and a short-term situation. Further, fair sharing of frequency bands can be realized by controlling communication within the cell using the usage guideline information. In addition, when the terminal device 2 determines that the usage guideline information violates the policy of its own terminal, the setting specific to the usage guideline information is not performed, so that the situation unique to each terminal device 2 is also taken into consideration. Control can be performed.

  When the communication quality acquired by the communication quality acquisition unit 12 is not information corresponding to the subjective quality information of the communication path evaluated by the user, the terminal device 2 includes the reception unit 11 that receives the evaluation by the user. It does not have to be.

  Further, when it is not determined whether the usage guideline information violates the wireless communication policy of the terminal device 2, the terminal device 2 may not include the determination unit 22. In this case, every time the usage guideline information is updated, settings corresponding to the updated usage guideline information are performed in the terminal device 2.

  Further, the base station receiving unit 15 may receive a beacon transmitted from another radio base station 1. Then, the usage guideline information generation unit 13 may generate the usage guideline information of the own cell using the usage guideline information included in the beacon transmitted from the other radio base station 1. For example, when the usage guideline information included in the beacon from another radio base station 1 includes an instruction to change the communication quality, the usage guideline information generation unit 13 similarly sets the communication quality. The usage guideline information in the downward direction may be generated. Further, for example, when the usage guideline information included in the beacon from another radio base station 1 includes an instruction to change the coding rate, the usage guideline information generation unit 13 Considering the possibility that the terminal device 2 is causing interference to surrounding cells, the usage guide information including an instruction to suppress transmission power may be generated. In addition, the instruction | indication which suppresses transmission power may be an instruction | indication which changes so that transmission power may become below a predetermined | prescribed upper limit, for example.

  Further, the communication quality and usage guideline information described in the present embodiment are examples, and they are not limited to the above description. Moreover, the information on the observation quality of the communication path and the subjective quality of the communication path evaluated by the user are also examples, and they are not limited to the above description. Moreover, although an example of the relationship between communication quality and each instruction | indication contained in usage guide information was demonstrated, they are not limited to the above-mentioned description. In this embodiment, the case where the emergency is a disaster is mainly described. However, the occurrence of an event that many people want to communicate with, such as the year-end and New Year holidays, is also included in the emergency. May or may not be considered. Further, in the present embodiment, the case where the communication quality acquisition unit 12 receives the evaluation of the communication path by the user via the processing unit 16 has been described. However, the communication quality acquisition unit 12 receives the evaluation from the base station reception unit 15. You may receive an evaluation. Further, the correspondence between the application and the application type may be fixed or may change. When the radio base station 1 does not perform transmission according to the carrier sense result, the radio base station 1 may not include the base station transmission control unit 18.

  In the above embodiment, each process or each function may be realized by centralized processing by a single device or a single system, or may be distributedly processed by a plurality of devices or a plurality of systems. It may be realized by doing.

  In the above embodiment, the information exchange between the components is performed by one component when, for example, the two components that exchange the information are physically different from each other. It may be performed by outputting information and receiving information by the other component, or when two components that exchange information are physically the same, one component May be performed by moving from the phase of the process corresponding to to the phase of the process corresponding to the other component.

  In the above embodiment, information related to processing executed by each component, for example, information received, acquired, selected, generated, transmitted, or received by each component In addition, information such as threshold values, mathematical formulas, addresses, etc. used by each component in processing may be stored temporarily in a recording medium (not shown) or for a long period of time, even if not specified in the above description. Good. Further, the storage of information in the recording medium (not shown) may be performed by each component or a storage unit (not shown). Further, reading of information from the recording medium (not shown) may be performed by each component or a reading unit (not shown).

  In the above embodiment, when information used by each component, for example, information such as a threshold value, an address, and various setting values used by each component may be changed by the user Even if not specified in the above description, the user may be able to change the information as appropriate, or may not be so. If the information can be changed by the user, the change is realized by, for example, a not-shown receiving unit that receives a change instruction from the user and a changing unit (not shown) that changes the information in accordance with the change instruction. May be. The change instruction received by the receiving unit (not shown) may be received from an input device, information received via a communication line, or information read from a predetermined recording medium, for example. .

  In the above embodiment, when two or more components included in the radio base station 1 or the terminal device 2 have communication devices, input devices, etc., the two or more components are physically single devices. You may have, or you may have a separate device.

  In the above embodiment, each component may be configured by dedicated hardware, or a component that can be realized by software may be realized by executing a program. For example, each component can be realized by a program execution unit such as a CPU reading and executing a software program recorded on a recording medium such as a hard disk or a semiconductor memory. At the time of execution, the program execution unit may execute the program while accessing the storage unit or the recording medium. In addition, the software which implement | achieves the wireless base station 1 in the said embodiment is the following programs. That is, this program uses a communication quality acquired by a communication quality acquisition unit and a communication quality acquisition unit that allows a computer to function as a radio base station that performs radio communication with one or more terminal devices and acquires communication quality related to radio communication. And a program for causing the usage guideline information generation unit to generate usage guideline information used in settings related to wireless communication and the base station transmission unit to transmit a beacon including the usage guideline information generated by the usage guideline information generation unit. .

  Moreover, the software which implement | achieves the terminal device 2 in the said embodiment is the following programs. In other words, this program causes a computer to function as a terminal device that performs wireless communication with a wireless base station, and receives a beacon including usage guideline information that is generated using communication quality related to wireless communication and used in settings related to wireless communication. Terminal receiving unit, setting unit for performing settings related to wireless communication according to usage guideline information included in the beacon received by the terminal receiving unit, terminal transmitting unit for transmitting information according to the setting by the setting unit, and terminal receiving unit This is a program for causing a terminal transmission control unit to control transmission by the terminal transmission unit in accordance with the result of carrier sense.

  In the program, the functions realized by the program do not include functions that can be realized only by hardware. For example, a function that can be realized only by hardware such as a modem or an interface card in an acquisition unit that acquires information, a transmission unit that transmits information, or a reception unit that receives information is included in at least the functions realized by the program I can't.

  Further, this program may be executed by being downloaded from a server or the like, and a program recorded on a predetermined recording medium (for example, an optical disk such as a CD-ROM, a magnetic disk, a semiconductor memory, or the like) is read out. May be executed by Further, this program may be used as a program constituting a program product.

  Further, the computer that executes this program may be singular or plural. That is, centralized processing may be performed, or distributed processing may be performed.

  FIG. 5 is a schematic diagram showing an example of the external appearance of a computer that executes the program and realizes the radio base station 1 and the terminal device 2 according to the embodiment. The above-described embodiment can be realized by computer hardware and a computer program executed on the computer hardware.

  In FIG. 5, a computer system 900 includes a computer 901 including a CD-ROM drive 905 and an FD (Floppy (registered trademark) Disk) drive 906, a keyboard 902, a mouse 903, and a monitor 904.

  FIG. 6 is a diagram showing an internal configuration of the computer system 900. In FIG. 6, in addition to the CD-ROM drive 905 and the FD drive 906, a computer 901 is connected to an MPU (Micro Processing Unit) 911, a ROM 912 for storing a program such as a bootup program, and the MPU 911. A RAM 913 that temporarily stores program instructions and provides a temporary storage space, a hard disk 914 that stores application programs, system programs, and data, and a bus 915 that interconnects the MPU 911, the ROM 912, and the like are provided. The computer 901 may include a network card (not shown) that provides connection to a LAN, WAN, or the like.

  A program that causes the computer system 900 to execute the functions of the radio base station 1 and the terminal device 2 according to the above embodiment is stored in the CD-ROM 921 or FD 922 and inserted into the CD-ROM drive 905 or FD drive 906. May be transferred to the hard disk 914. Instead, the program may be transmitted to the computer 901 via a network (not shown) and stored in the hard disk 914. The program is loaded into the RAM 913 when executed. The program may be loaded directly from the CD-ROM 921, the FD 922, or the network.

  The program does not necessarily include an operating system (OS) or a third-party program that causes the computer 901 to execute the functions of the radio base station 1 and the terminal device 2 according to the above-described embodiment. The program may include only a part of an instruction that calls an appropriate function or module in a controlled manner and obtains a desired result. How the computer system 900 operates is well known and will not be described in detail.

  Further, the present invention is not limited to the above-described embodiment, and various modifications are possible, and it goes without saying that these are also included in the scope of the present invention.

  As described above, according to the wireless communication system and the like according to the present invention, it is possible to transmit the usage guide information to each terminal device without using an individual control message. For example, as a wireless LAN system or the like, Useful.

DESCRIPTION OF SYMBOLS 1 Radio base station 2 Terminal apparatus 11, 24 Reception part 12 Communication quality acquisition part 13 Usage guideline information generation part 14 Base station transmission part 15 Base station reception part 16, 25 Processing part 17, 26 Transmission queue 18 Base station transmission control part 21 Terminal reception unit 22 Judgment unit 23 Setting unit 27 Terminal transmission unit 28 Terminal transmission control unit

Claims (10)

A wireless communication system comprising a wireless base station and one or more terminal devices that perform wireless communication with the wireless base station,
The radio base station is
A communication quality acquisition unit that acquires communication quality related to wireless communication;
Using the communication quality acquired by the communication quality acquisition unit, a usage guideline information generation unit that generates usage guideline information used in settings related to wireless communication,
A base station transmission unit for transmitting a beacon including the usage guideline information generated by the usage guideline information generation unit;
A base station receiving unit for receiving information transmitted from the terminal device,
The communication quality is determined based on the subjective quality information of the communication path from the terminal device and the request level information for determining the communication quality request level set on the radio base station side. Improved with increasing, the quality level is set according to the request level specified in the request level information,
The terminal device
A terminal receiver for receiving the beacon;
A setting unit for performing settings related to wireless communication according to usage guideline information included in the beacon received by the terminal reception unit;
A terminal transmission unit that transmits information according to the setting by the setting unit;
A terminal transmission control unit that controls transmission by the terminal transmission unit according to a result of carrier sense using the terminal reception unit;
A reception unit that receives a communication path evaluation from a user ,
The terminal transmission unit transmits the evaluation received by the reception unit to a radio base station,
The base station receiver receives the evaluation transmitted by the terminal transmitter,
The said communication quality acquisition part is a radio | wireless communications system which acquires the communication quality according to the information of the subjective quality of the communication path | route evaluated by the user acquired using the evaluation which the said base station receiving part received . The request level information is information indicating an emergency or a normal time,
The wireless communication system according to claim 1, wherein the communication quality is set higher in the normal time than in the emergency. The terminal device
A determination unit for determining whether the usage guideline information violates a wireless communication policy of the terminal device;
The setting unit does not perform setting according to the usage guideline information when the determination unit determines that the usage guideline information violates a wireless communication policy of the terminal device, and the usage guideline information is The wireless communication system according to claim 1 or 2 , wherein when the determination unit determines that it does not violate the wireless communication policy of the terminal device, the setting is performed according to the usage guideline information. The terminal device
It further comprises a measurement unit that measures the observation quality of the communication path,
The terminal transmission unit transmits the observation quality measured by the measurement unit to the radio base station,
The wireless communication system according to claim 1, wherein the communication quality is improved with an increase in the observation quality. The usage guideline information is
5. The method according to claim 1, further comprising instructions regarding one or more selected from a modulation scheme, a coding rate, a frequency, transmission power, signal bandwidth, communication quality control, and communication priority. Wireless communication system. The base station receiving unit receives a beacon transmitted from another radio base station,
The wireless communication system according to any one of claims 1 to 5, wherein the usage guide information generation unit generates usage guide information using also usage guide information included in a beacon transmitted from another radio base station. . The wireless communication system according to claim 1, wherein the usage guide information is information for each application. A wireless base station that performs wireless communication with one or more terminal devices,
A communication quality acquisition unit that acquires communication quality related to wireless communication;
Using the communication quality acquired by the communication quality acquisition unit, a usage guideline information generation unit that generates usage guideline information used in settings related to wireless communication;
A base station transmission unit for transmitting a beacon including the usage guideline information generated by the usage guideline information generation unit;
A base station receiver that receives the evaluation of the communication path received from the user in the terminal device, transmitted from the terminal device, and
The communication quality acquisition unit acquires the communication quality according to the subjective quality information of the communication path evaluated by the user, acquired using the evaluation received by the base station reception unit,
The communication quality is determined based on the subjective quality information of the communication path from the terminal device and the request level information for determining the communication quality request level set on the radio base station side. A radio base station that is improved with an increase in quality, and the quality level is set according to the request level specified by the request level information . A wireless communication method processed in a wireless base station that performs wireless communication with one or more terminal devices,
A base station receiving step of receiving an evaluation of a communication path received from a user in the terminal device, transmitted from the terminal device;
Communication quality acquisition step of acquiring communication quality related to wireless communication according to information on subjective quality of the communication path evaluated by the user, acquired using the evaluation received in the base station reception step ;
Using the communication quality acquired in the communication quality acquisition step, a usage guideline information generation step for generating usage guideline information used in settings related to wireless communication,
A base station transmission step for transmitting a beacon including the usage guideline information generated in the usage guideline information generation step ,
The communication quality is determined based on the subjective quality information of the communication path from the terminal device and the request level information for determining the communication quality request level set on the radio base station side. A wireless communication method , which is improved with increase and the quality level is set according to a request level specified by the request level information . Computer
Function as a wireless base station for wireless communication with one or more terminal devices,
A communication quality acquisition unit for acquiring communication quality related to wireless communication;
Using the communication quality acquired by the communication quality acquisition unit, a usage guideline information generation unit that generates usage guideline information used in settings related to wireless communication,
A base station transmission unit for transmitting a beacon including the usage guideline information generated by the usage guideline information generation unit ,
Function as a base station receiver that receives the evaluation of the communication path received from the user in the terminal device, transmitted from the terminal device ,
The communication quality acquisition unit acquires the communication quality according to the subjective quality information of the communication path evaluated by the user, acquired using the evaluation received by the base station reception unit,
The communication quality is determined based on the subjective quality information of the communication path from the terminal device and the request level information for determining the communication quality request level set on the radio base station side. A program which is improved with an increase and the quality level is set according to the request level specified by the request level information .

Images